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The general inclusion

Consider Remark 1.3.2. (b) Now prove the general inclusion exclusion formula given by the expression (1.3.13). 1.3.13 Three distinct integers are chosen at random from the first 20 positive integers. Compute the probability that: (a) their sum is even; (b) their product is even.

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The integrand

If the sample space is  and if  is a set for which the integral  exists, show that this set function is not a probability set function. What constant do we multiply the integrand by to make it a probability set function?

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Positive integers

Compute the probability of being dealt at random and without replacement a 13-card bridge hand consisting of: (a) 6 spades, 4 hearts, 2 diamonds, and 1 club; (b) 13 cards of the same suit. Three distinct integers are chosen at random from the first 20 positive integers. Compute the probability that: (a) their sum is

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Raffle

A person has purchased 10 of 1000 tickets sold in a certain raffle. To determine the five prize winners, five tickets are to be drawn at random and without replacement. Compute the probability that this person wins at least one prize. Hint: First compute the probability that the person does not win a prize.

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