discrete math

How many strings of five uppercase English letters are there
(a) that start or end with the letters BO (in the order), if letters can be repeated? (inclusive or)


(b) that start with an X, if letters can be repeated?


(c) that start with the letters BO (in that order), if letters can be repeated?


(d) if letters can be repeated?

  1. 👍 0
  2. 👎 0
  3. 👁 408

Respond to this Question

First Name

Your Response

Similar Questions

  1. geometry

    In the English alphabet, there are 7 capital letters that look the same after being rotated 180∘. Those letters are H, I, N, O, S, X, and Z. How many different 3 letter "words" can be made from these letters such that when the

  2. math

    School started at 8:05 a.m. and ended at 2:40 p.m. The work below shows Erica’s calculation of the length of the school day. Which two errors did Erica make? 1.She subtracted instead of adding the times. 2.She subtracted the end

  3. Dennis

    How many ways can the letters of the word HAPPINESS be arranged. If H must start the word, N must end the word and the P's must be separated? [question from the topic FACTORIAL,PERMUTATION AND COMBINATION ]

  4. statistics

    A license plate is to have 3 digits followed by 2 uppercase letters. What is the number of different license plates possible if repetition of numbers and letters is not permitted?

  1. Math I NEED HELP

    So I need the answers ASAP Question 1 of 7 Ken finished one-fifth of his chores before breakfast and three-fifths of his chores after breakfast. What fraction of his chores does he have finished altogether? A. Start Fraction 4

  2. Helpppppp

    Use benchmarks to estimate the sum. three-fifths+start fraction 3 over 17 end fraction A. 2 B. one-half C. 1 D. 0 Estimate the difference. 6five twelvths – 4one ninth A. 2 B. 3 C. 1 D. 4 Estimate the product. 6four

  3. Math

    3.12.1 - Test: Exponents, Factors, and Fractions Unit Test Which statement is true? A. start fraction 29 over 35 end fraction less than start fraction 20 over 30 end fraction B. Start Fraction 18 over 34 End Fraction greater than

  4. Mathematics-Fractions

    Find the sum, 3 Start Fraction 4 over 9 End Fraction plus 5 Start Fraction 1 over 3 End Fraction equals? Find the sum, 11 Start Fraction 1 over 5 End Fraction plus 2 Start Fraction 1 over 2 End Fraction equals? Find the sum, 7

  1. Math

    Multiple Choice What are the equivalent fraction and decimal for thirty three and one-third%? A. start fraction 1 over 33 end fraction and 0.3 B. start fraction 1 over 33 end fraction and 3 C. 3start fraction 1 over 3 end fraction

  2. Helpppppp

    In Exercises 1–4, find each sum or difference. start fraction 5 over 10 end fraction minus start fraction 3 over 10 end fraction A. one-fifth B. start fraction 8 over 10 end fraction C. start fraction 42 over 5 end fraction D.

  3. math

    Write a ratio for the situation in three ways, comparing the first quantity to the second quantity. A zoo has 17 monkeys and 12 chimpanzees. A. 12 to 17, 12:17, twelve-seventeenths B. 17 to 12, 17:12, start fraction 17 over 12 end

  4. Math

    Which uppercase letters of the alphabet have rotational symmetry?

You can view more similar questions or ask a new question.