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1. A club has 25 members. i. Number of ways to choose four members of the club to serve on an executive committee? ii. Number of ways to choose a president, vice president, secretary, and treasurer of the club, where no person can hold more than one off

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1.A club has 25 members.How many ways are there to choose four members of the club to serve on an executive committee?How many ways are there to choose a president, vice president, secretary, and treasurer of the club, where no person can hold more than one office? 2.In how many different ways can five elements be selected in order from a set with three elements when repetition is allowed? 3.What is the probability that a fair die never comes up an even number when it is rolled six times? (Note: Enter the value of probability in decimal format and round it to three decimal places.) 4.Let p and q be the propositions p :You have the flu. q :You miss the final examination. Identify the English sentence that expresses the compound proposition p → q. 5. Let q and r be the propositions q :You miss the final examination. r :You pass the course. The English sentence of the compound proposition ¬q ↔ r is "You do not miss the final exam if and only if you pass the course." 6.)Let q and r be the propositions q :You miss the final examination. r :You pass the course. The English statement for the compound proposition q → ¬r is "If you miss the final exam, then you pass the course." 7.)Let p, q, and r be the propositions p :You have the flu. q :You miss the final examination. r :You pass the course. Identify the statement that express the compound proposition p q r as an English sentence. 8.)Let p, q, and r be the propositions p :You have the flu. q :You miss the final examination. r :You pass the course. Identify the English sentence of the compound proposition (p → ¬r) (q → ¬r). 9.Let p, q, and r be the propositions p :You have the flu. q :You miss the final examination. r :You pass the course. The English sentence of the compound proposition (p q) (¬q r) is "Either you have the flu and miss the final exam, or you do not miss the final exam and do pass the course." 10.) True or False :The negation of the statement "Kwame will take a job in industry or go to graduate school." using De Morgan's law is "Kwame will not take a job in industry or will not go to graduate school."

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Logic and permutation solutions

1. A club has 25 members.

i. Number of ways to choose four members of the club to serve on an executive
committee?

ii. Number of ways to choose a president, vice president, secretary, and treasurer of
the club, where no person can hold more than one office



Solution

i. It will be 25C4

or C(25,4)= 12650 ways

ii. P(25,4)

=25*24*23*22

=303600 ways

2. Ways five elements can be selected in order from a set with three elements when
repetition is allowed



Solution

Since each of the tasks can be completed in 3 different ways because we have 3 elements
to choose from, the total number of ways of selecting 5 elements will be

35=243

3. Probability that a fair die never comes up an even number when it is rolled six times



Solution

The probability that any given fair die roll appears up is ½ .

Since this rolls are independent, we have the probability of an odd showing up all 6 times
is ½6 =1/64

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