How many strings of six uppercase English letters (A to Z) are there (a) if letters may be repeated? Repetition of letters in the string is allowed. That's drink more. Jy: (y > 0^ (0ZIVI >y)) Ogr.Jy. EXAMPLE 15 Suppose that there are 9 faculty members in the mathematics department and 11 in the computer Each play at least one game of the following games; volleyball, basketball, table tennis. = 720 Hence, the number of four lettered words can be made with the word FLOWER is 360 words. Can corresponding author withdraw a paper after it has accepted without permission/acceptance of first author, Copy the n-largest files from a certain directory to the current one, User without create permission can create a custom object from Managed package using Custom Rest API. = 720 Given there are two 100 fish tanks. 23 0 obj c. two dozen bagels? How many ways are there to form a committee with six members if it must have the same number of men and women? How many ways are there to award the prizes if Suppose that X, , ,x, are i.id. 9695P(4,2) = 109,440. Section 6.1 [12pt] 8. 18 students only used the periodicals. a. there are no restrictions? The first piece. B .. Z (26) = 308915776 / Angrier 2. . And for . check one character at a time on the basis of ASCII values. 3 0 obj endobj Let X represent the ycar and the high temperature Based on the data shown below, calculate the regression line (each value to two decimal places)_13.95 12.54 10.63. it's clear. >> Chapter 6.5 3. Oh, it's two possible big would be. And, a crew of six people to go on a, A: A permutation of a set is an arrangement of its members into a sequence or if the set is already, A: It is given that, 3A!2JHg$+ 3F`5>2j =!LH;j#2mJml 0$puV0oda`9@7k3 .~^ q6-'-`vO5! F8 jC0!f: Y+v7+Qg?N 3`@@N^ aUC:03}?Yo&Ia*{AC 4?O)]=~??~ {A; C~? {{abc}, {acb}, {bac}, {bca}, {cab}, {cba}}. e. the strings CAB and BED? g. 26-21 = 6,230,721,635 `[MCF1 IDl$rVT>} yd= qN,1],8>BCjpcX*NjQ|g Which means when I go back and I try to pick a second letter. 2) if no letter can be repeated? a. the bride must be next to the groom? (521)C(6,2) = 72,930,375 Let A = {a,b,c}, B = {x,y}, and C = {0,1}. This is if I'm not repeating any of my letters. /Font << /F40 7 0 R /F24 10 0 R /F15 11 0 R /F27 9 0 R /F41 8 0 R /F22 12 0 R >> It would be to power to the six. 5) that start and end with an X, if letters can be repeated? Emphasis 3 incomestatement sis to complete the folewing questions im and Beth Buter are abort to consruct ther income and expense statement fer ending December 31, 2014. a. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. (You can select multiple answers if you think so) Your answer: Volumetric flask is used for preparing solutions and it has moderate estimate of the volume. How many strings are there of lowercase letters of length four or less, not counting the empty string? Is "I didn't think it was serious" usually a good defence against "duty to rescue"? We don't want to look back now. So yes, now in some action. 31. y" + y = sin : + i cos + + 10' 32. y" - y = 2+ + te? c. 26-21 = 223,149,665 25! Episode about a group who book passage on a space ship controlled by an AI, who turns out to be a human who can't leave his ship? It was 64. :lB'9a]t9(_h?-{QJxnIuuq4&ugYJJM@;F`n1VZ>pR 1ec,Y Dbcj[|r( z6FC(veyg>8U}+v1O(\{Y\#C3LANY&7V.`}!_t*2X*J^{z42h.B6M>3-, How many different strings are there of length 7? This is an exam 10. value: 10.00 points You can purchase a residential building lot for $90,000 cash, or for $20,000 down and quarterly payments of $5000 for four years. Where might I find a copy of the 1983 RPG "Other Suns"? 2^7-1. endstream There are totally 26 letters possible. + 1221 x" - x' - 2x = e' cos - + cost y" + 5y' + 6y What is the appropriate adjusting entry on March 31st for the insurance that was purchased on January 29th for $1.250 and covers the period February 1st - June 30th? Excuse me. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. In 5e D&D and Grim Hollow, how does the Specter transformation affect a human PC in regards to the 'undead' characteristics and spells? c. 5! 2 pennies and 6 nickels How many strings of eight English letters are there Find the composite function (f o g) (x) given that f = {(1,6), (4,7), (5,0)} and g = {(6,1), (7,4), (0,5)}, There were 100 students in the library who responded to how they completed their research papers. /ProcSet [ /PDF /Text ] pyridinium chlorochromate OH OH CO_, B) One of these two molecules will undergo E2 elimination "Q reaction 7000 times faster. So for a bit strings off to would then be you with me for, um, a possible cases would be 00 01 1011 If we're to apply a general case in solving a bit strings offline, we would then have to see the power of case. ;[p*Y>wE#M1*KX#>%?z9!97An#l**bI$"E Ml:}g4ihD"'};RKh0iHeMBUlT X>a:pF$WgS$J.#croV The number of $6$-letter strings is $(21+5)^6$, The number of $6$-letter strings with no vowels is $21^6$, The number of $6$-letter strings with at least one vowel is $(21+5)^6-21^6$, The number of $6$-different-letter combinations is $\binom{21+5}{6}$, The number of $6$-different-letter combinations with no vowels is $\binom{21}{6}$, The number of $6$-different-letter combinations with at least one vowel is $\binom{21+5}{6}-\binom{21}{6}$, The number of $6$-different-letter permutations is $\binom{21+5}{6}\cdot6!$, The number of $6$-different-letter permutations with no vowels is $\binom{21}{6}\cdot6!$, The number of $6$-different-letter permutations with at least one vowel is $\binom{21+5}{6}\cdot6!-\binom{21}{6}\cdot6!$. [295.1 531.3 885.4 531.3 885.4 826.4 295.1 413.2 413.2 531.3 826.4 295.1 354.2 295.1 531.3 531.3 531.3 531.3 531.3 531.3 531.3 531.3] The easiest way is to count all the strings of length six ($26^6$) and remove those that don't have an "a" in them ($25^6$). 1 penny and 7 nickels Keneth H. Rosen. The adjusted basis at the beginning of the year is $400,000. Label all primary, secondary, and tertiary carbons. b. exactly two vowels? The objective is to determine the number of strings of six lowercase letters from English alphabet contains the letters a and b where a is somewhere to the left of b in the string, with all the letters are distinct. ( 4 2) ( 2 2) arrangements with two double letters. V. Experts are tested by Chegg as specialists in their subject area. 14 0 obj << 1. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. [6pt] How many strings of eight uppercase English letters . How many license plates can be made using either two or three uppercase English letters followed by either two or three digits? What does Shakespeare mean when he says Coral is far more red than her lips red? ii. counting number of strings with at least one consonant. 2) if no letter can be repeated? 2.52.01.51.00.5Fi0.0-0.5-1.0-1.522.0meters 22.0 -15 -1.0 -0.5 0.0 0.51.01.52.02.5, 21 pts] Pesigths; w(r,0) Wx(0,t) Wtt WII "satisfyitign ~i W_(1,t) of #1 variables "(1,0) 01 find the 8 5 solution 8 3 8 0 > / > vibrating string, Use the data given bclow construct Bom-} Haber cycle to determine the electron affinity of Br: 4Hskl) K() K(g) Klg) K ()+e 419 Brz(n) 2 Br(g) 193 Kls) Brz(g) KBr(s) 3394 KBrs) K( Br (g) 674A)-885 kJB) -325 kJ+367 kJD) -464kJ. L) , |41 / ,cosrcoszr = cos3rcos4r (0 > endobj f. 97P(4,3) = 2328 = 40,320 Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. 212014 = 8,204,716,800 So let's say that I wanted to do three, so I would have 26 possibilities multiplied by another 26 possibilities, but multiplied by another pop. If an event can appear in either in em ways or in any way in this case is not overlapping. Yeah, that history would have the length ranging. d. C(10,5) = 252. Jo (a1oayL /eluawapunJ a41 &sn (iujod L) waiqold KXON 1S17 waiqold waiqold snolald 5 wajqoxd :uolJeJbaJu] pUV eaJV 8 Juauubisst uolieibajul"pue eaje ua #32 U. Solution: Given, =>Strings of 6 uppercase english letters (1) Explaination: =>Total number of uppercase letters = 26 (A - Z) Finding total number of strings in which letters can be repeated: =>At each place there can be any letter out of 26 letters. d. C(11,4) = 330. Why SJF Cannot be implemented practically? As two positions are to be selected, so It is given that there are 5 different colored beads. How many strings of six letters are there, | Chegg.com Math Statistics and Probability Statistics and Probability questions and answers i. a. that contain no vowels, if letters can be repeated? Okay, so I'm looking at the possibilities of combinations of letters. The best answers are voted up and rise to the top, Not the answer you're looking for? iii. A coin is flipped 10 times where each flip comes up either heads or tails. Copyright 2023 MassInitiative | All rights reserved. The number of 6-letter strings with no vowels is 216. Why did DOS-based Windows require HIMEM.SYS to boot? 18 students only used the periodicals. Why six. How many strings of 6 lowercase letters of the English alphabet contain = x+4xy+6xy+4xy+y. How many permutations of the letters ABCDEFGH contain /Length 10264 (b) if no letter may be repeated? The cookie is used to store the user consent for the cookies in the category "Performance". Okay. That's right, it's the someone now using, so we would have to less for unless a must 16 most 32 less 64 this equal to 126. e. 26-21 = 171,004,205,215 e. P(8, 8) Okay, Now, what if I couldn't repeat my work? " 9Sz! E@!Pb6 ps~L#QsHLg K @k They're asking us how many streams are there of six. LANSING CO Cuestion 17 Annual high temperatures in a certain location have been tracked for several years. A bagel shop has onion, poppy, egg, salty, pumpernickel, sesame, raisin, and plain bagels. Make sure to justify your answer: Standard operations are used unless otherwise noted: 1) T-{(a Mz, a+c=0 and b+d+ f = 0 { 1. ii. ; Three 'x'es: choose three places and fill remaining one place with . 10-10 = 990 b. draw a binary search tree by inserting the values 50, 76, 21, 4, 32, 64, 15, 52, 14, 100, 83, 2, 3 and 70. Start your trial now! = 5040 f. that contain exactly one vowel, if letters can be repeated? a. Falcon, Inc., owns a silver mine that it purchased several years ago for $925,000. How many bits strings are there of the length six.. 4. The cookie is used to store the user consent for the cookies in the category "Analytics". How many possibilities are there for the win, place, and show (first, second, and third) positions in a horse race with 12 horses if all orders of finish are possible? How many case histories sipping to a new case of three etcetera go all the way to late six, combining all this result which is to well, what a 16 32 64 South similar? What are your chances of choosing an A on the first draw? d. P(8, 5) a. So that means that the number here, it's going to be 2 to the power of eight, Which is going to be 256.. Everyone to do with sold ing. Treat the two children and the as a system, (a) Calculate the angular momentum of the system, treating each child as a particle. If you want, A: We have to determine the number of permutations of the letters ABCDEFGH which contain the strings BA, A: a) If starting and ending letters are same and letters can't be repeated? How many strings of six lowercase letters from the English alphabet contain the letters *a* and *b* with all letters different? 26 + 25 + 24 + 23 + 22 +2+1=27 1 = 127 bit strings altogether. Should I re-do this cinched PEX connection? A multiple-choice test contains 10 questions. There are four possible answers for each question. Lansing Company's current-year income statement and selected balance sheet data at December 31 of the current and prior years follow. How many different strings are there of length 7? How many bit strings of length 10 contain at least 3 1s and at least 3 0s? What were the most popular text editors for MS-DOS in the 1980s? 1 How many strings are there of lower case letters of length four or less? Consider the provided question, You are double-counting those strings which both begin with two 1s and end with three 1s. d. C(10,5) = 252. 3) that start with an X, if letters can be repeated? Arranging the alphabet such that every vowel is followed by at least two consonants. {i,,0VSd1|9>}'S}|Q`YWu?c To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How many strings are there of lowercase letters of length four or less, not counting the empty string? A 4 mem. 2 Draw a Venn diagram of set A, B, C where (i) A and B have elements in common, B and C have element in common but A and C are disjoint. >> / [r! So it would just be zero and one. endobj 4 How many different strings of length 4 can be formed using a letters of the word flower? Now went back to the problem. iPad. Within Benzene (1) and ethyl benzene (2) form ideal liquid solutions and can be described by Raoult's Oa Guat the domains of [ejtaltg listureatne realnumbers Select the negation of Jr.Vy- (v < 0v (0 <*4 OV0 0V (0 > IVI 2")) OVz. How many license plates consisting of three letters followed by three digits contain no letter or digit twice? A: We have to find different license plate numbers are possible. However, you may visit "Cookie Settings" to provide a controlled consent. c. C(10,4)+C(10,5)+C(10,6)+C(10,7)+C(10,8)+ C(10,9)+C(10,10) = 848 Learn more about Stack Overflow the company, and our products. 2 = 1024 h. none of the people holding tickets 19, 47, 73, and 97 win prizes? Half{therefore, 5000. b) the letters a and b? Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. We have to make a string of 8 uppercase English Letters., A: Given the question that, How many ways are there for 8 men and 5 women to stand in a line so that no two women stand next to each other? .@rA7/! Develop an estimated regression equation for the data of the form = bo + ba (to 2 decimals, if 6. Sturting with 4.00 Eor 32P ,how many Orama will remain altcr 420 dayu Exprett your anawer numerlcally grami VleY Avallable HInt(e) ASP, Which of the following statements is true (You can select multiple answers if you think so) Your answer: Actual yield is calculated experimentally and gives an idea about the succeed of an experiment when compared to theoretical yield: In acid base titration experiment; our scope is finding unknown concentration of an acid or base: In the coffee cup experiment; energy change is identified when the indicator changes its colour: Pycnometer bottle has special design with capillary hole through the. B. 25242322 = 303,600. "anenap 841 puI 01 sningie? C(25,4) = 12,650 x+x+x+x+x = 21 These cookies track visitors across websites and collect information to provide customized ads. Number of different letters present in the given word = G,O,L a. exactly one vowel? So two cap elite, the bit strings of length one one. d) the letters a and b, where a is somewhere to the left of b in the string, with all the letters distinct? "Mitchy, Willy, Mo's been here 10, Johnny five (or) six, and just to get over that hump is obviously huge mentally for us. So it would mean that it cured. 1 0 obj /Filter /FlateDecode b. And since it's a string of bits, there are two possibilities for each death. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. a) thesetofpeoplewhospeakEnglish,thesetofpeople who speak English with an Australian accent. In how many ways can a set of five letters be selected from the English alphabet? 15 students used books, the web, and periodicals. So this reeks of length One is two bits Drinks of two for also equals 22 to the power of to I lost the strings of my three is too Do you to the power of three less mystery in safely or two to the power for waas Do you two to the power of this? April 30, 2023. C(10,3) = 120 Multiple Cholce The first ofthe propagatlon steps Is rale-delermlnlng because Its transition state Is &t lower energy: The ' encrgy diagram (or the propagallon sleps has three energy barrler Identily (he above homlnin by Sclentific narre: (Gequs (d Species) (0 ptsk IGcnu 4. Total number of strings of six lowercase letters from the English, A: Given, e. 4! 6 0 obj << I don't understand the difference between $C(26,6)$ and $26^6$. c. 8!(8-1)! (c) that contain exactly one B, if letters may be repeated? You will have to make $4$ cases:-Only one 'x': you can place it at any one of the four available places and fill remaining three places with remaining $25$ letters in $4\choose1$$\cdot25^3$ ways. >> endobj 40 s, There are 70 women in class. The number of way with event can appear in this case with M plus. Required information Use the following information for the Problems below. v?o+%$^ ga1}f?;SizW{o8qL0L.FN8TQH8)F''R]2"Bp7ei;Cy{^$ 3 22 24 26 30 35 40 y 12 21 33 35 40 36 a. 5 pennies and 3 nickels Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI, Combinatorics question about english letters (with consonants and vowels), String of letters and ways to have at least one vowel. B. How many permutations of {abcdefg} end with a? Then you divide this by the factorial of similar elements. The o re MCCmo yach: that sails among the 4J00 Greek islands charges 5660 p2r person exartly 20 peopl sign Lp for the cruise However; Mcre tnar 20 peop capacity cf 90) sion U? f. the strings BCA and ABF? How many strings of six letters are there? d. 5252419 = 12,113,640,000 6!-(25!) How many $7$ letter codes can be composed of $4$ distinct English and $3$ distinct Greek letters? Why does the narrative change back and forth between "Isabella" and "Mrs. John Knightley" to refer to Emma's sister? Let X be a continuous random variable with probability density function f(x) = { if x > 2 otherwise 0 Check that f(-x) is indeed a probability density function. [500 500 1000 833 333 333 333 500 570 250 333 250 278 500 500 500 500 500 500 500 500 500 500 333 333 570 570 570 500 930 722 667 722 722 667 611 778 778 389 500 778 667 944 722 778 611 778 722 556 667 722 722 1000 722 722 667 333 278 333 581 500 333 500 556 444 556 444 333 500 556 278 333 556 278 833 556 500 556 556 444 389 333 556] it's clear. How many Stings of 6 uppercase english letter are there- " if ilettery can be Repeated:- 26 26 26 26 26 2 6 A. Output : Your string is 138 characters long. It's true one. 2- C(100,0) -C(100,1)-C(100,2) = 2-5051. = 120 b. all x 2 "anenap 841 puI 01 sningie? 0 pennies and 8 nickels How many six-letter "words" can be formed from the alphabet $\{a-z\}$, if a "word" contains at least one vowel and at least one consonant? xZKo7WCVhHm Z EZIJp9e`7! You need to do this for every differnt kind of element. MEiE!j!S`{ y%k[`?X5 bS?&&p[0 There are 266strings that start and end with anX, and216of those that don't have any vowel, so the answer is266216. e. 9897P(4,2) = 114,072 Please resubmit the question and, A: Total number of permutations of 26 letters (N) = 26! . xT\.JH443tIwI03 ]%H !HKt7p{5s])"!@@A r8P5o;6#BF@e8` q@ >A a. Four different prizes are awarded, including a grand prize (a trip to Tahiti). 26 + 25 + 24 + 23 + 22 + 21 = 27 2 = 126 32. How many different pairs of airlines can you choose on which to book a trip from New York to San Francisco via Denver, when you pick an airline for the flight to Denver and an airline for the continuation flight to San Francisco? Since your question has multiple sub-parts, we will solve first three sub-parts for you. rev2023.5.1.43405. d. the strings AB, DE, GH? 6) that start with the letters BO (in that order), if letters cannot be repeated? A baseball fan has a pair of tickets for six different home games of the Chicago, A: Given: We reviewed their content and use your feedback to keep the quality high. These cookies ensure basic functionalities and security features of the website, anonymously. How many arrangements can be made from the letters of the word mountains if all the vowels must form a string? How many strings of six lowercase letters from the English alphabet Mokdad said that XBB.1.16 is gaining ground on the previously dominant strain in the U.S., called XBB.1.5. Evaluate the integral J J Jd cydV, where D is the solid region in R3 bounded by the planes I = 0, y = 0, 2 = 0, I +y = 1, and + z = 1. c. 526 = 40,159,050,880 How many bits strings are there of the length six.. Total number of ways = 10! Basically, what they want us to do is to combine. i.e if started with BO then next 3 Letters can be, A: Total alphabet in English =26 The OP has a test. Required information Use the following information for the Problems below. b. How many possible bits are there? Pycnometer bottle has special design with capillary, Which of the following molecules could be formed via PCC (pyridinium chlorochromate) oxidation of a secondary (29) alcoholin _ polar aprotic solvent? 1. Solve the following IVP"s:dy I+4 4 -y(1) = 1b) (xcos zy + y)y + ycoszy + e = 0~IV +y=ey9(1) = 1=Yet + e + y? /Resources 14 0 R C(13,6) = 1716 (Algo) [The following information applies to the questions displayed below.] That's what you survival. This cookie is set by GDPR Cookie Consent plugin. Why does the narrative change back and forth between "Isabella" and "Mrs. John Knightley" to refer to Emma's sister? 2. [2pt] How many bit strings are there of length six or less, not counting the empty string? b. b. &lCcx)1/3%Rq[Wiq+h[tsUyn*f'`t EI&66`M83U, 56 ~^tw/Z !Z0upW:c% 9zRo !|{ q-rX?6c9Kc@hTsh(@PKD*9Q1i#9#Y8 !D59T{a;om+"*ShW4r0@#! f. 0 (impossible since BCA and ABF both contain B). Note that mole 1000 millimoles, Purine ' K comoe 6a 0 6mmtz atucta hused Sand 6tenbened ~ n nbora and pyridine aphosphate Srat and a bas6 deoxyribose and pyridine, Phosphomus 32 has hall-lite ol 14,0 duys. What is the symbol (which looks similar to an equals sign) called? 3.have exactly three 9s? What were the most popular text editors for MS-DOS in the 1980s? 521C(6,1) = 122,523, 030 How many strings of six lowercase letters from the English alphabet contain the letters *a* and *b* with all letters different? The reason is because $26^5$ is the list of all strings of length five, and while there are six different ways to insert an "a" into each of those strings, some of those strings already have an "a" or more than one "a" in them. Please give the worst Newman Projection looking down C9-C1O. That increased transmissibility appears to be due to the subvariant's ability to avoid . Its oil having case this year? I agree with everything you said, except for the "almost agree with" part. In how many different ways can five elements be selected in order from a set with three elements when repetition is allowed? d. 26-21-122,523,030 = 100,626,625. If, A: The formula for combination is C(n, r) =n! 5!/(5-1)! 5. %PDF-1.5 How many different three-letter initials are there that begin with A? Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. f. 10!(10-9)! g. the people holding tickets 19, 47, 73, and 97 all win prizes? I don't think this particular question is there, but if someone has a different threshold, then it's reasonable he would downvote the answers. Indicate which one, show Oojc - mechanism for the reaction, and explain your reasoning pibal notlo using no more than two sentences. $\mathrm{SUM}$. So today we're trying to solve the questions. 3) that start with an X, if letters can be repeated? The cookie is used to store the user consent for the cookies in the category "Other. How many strings of six letters are there, using the English letters? . Help which has a mass of 1.70 x 102 kg and a radius of 1.2 m, Simplify using the properties of identities, inverses, and zero.$rac{0}{u-4.99},$ where $u $26^6-25^6$ by the principle of inclusion-exclusion. Input: You have to either perform the replace before you split the string or perform the replace onevery element of the array separately. Learn more about Stack Overflow the company, and our products. Suppose that X, , ,x, are i.id. Wordless. You use this when you are interested in an arangement but you have elements which are similar. Endless. The 1st 1 this product for private was mean that if you have one of them that pure in every way. Find P(X > 5) and E[X]. Capital letters were usually stored in a higher (or upper) case, and small letters were usually stored below in a lower case. In short, although I am 100% sure this is in your textbook (and, to be honest, if you don't know that it is in your textbook and your test is tommorow, I don't have high hopes for you): If you are picking $k$ items out of $n$ and: order matters and you are not replacing the items: $n\cdot (n-1)\cdots (n-k+1)$, order matters and you are replacing the items: $n^k$. (You can select multiple answers if you think so) Your answer: Actual yield is calculated experimentally and gives an idea about the succeed of an experiment when compared t0 theoretical yield. b. Linear Combination of Vectors a) Write as a single vector in R2, in unit vector notation: 3(8 + 5j)+4(21 _ 3j) b) Write as a single vector in R3, in ordered triple notation: ~[2,-1,1]+5[0, -3, -11] bujujewaj siduualle aney noX sawii waiqoud Sj41 pajduuaije aneY nox SJaMsuV IllgnS SJaMSuV AW Manald 4+ T? Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? 4999897 = 3,764,376 Heating function of the hot plate is used in "changes of state", B) One of these two molecules will undergo E2 elimination "Q reaction 7000 times faster. They sample 100 residents who are privately insured, 100 with Medicaid, 100 with no health insurance, 100 with Medicare, and 100 with Tricare insurance. Adding EV Charger (100A) in secondary panel (100A) fed off main (200A). Discrete Mathematics and its Applications. Do not solve. Finding the no of ways to count the letters in an English alphabet, Counting the number of strings that start and end with the same letter, are palindromes, or contain vowels only, How many 6-letter strings contain neither the word 'bob' nor 'tim'.