Problem 1

Problem set 1 May 29, 2020

If A, B and D are three events such that P (A âˆª B âˆª D) = 0.7, what is the value of P(AC âˆ©BC âˆ©DC)?

Problem 2

Prove the following identity for any three events A, B and C:

P (A âˆª B âˆª D) = P (A) + P (B) + P (C) âˆ’ P (A âˆ© B) âˆ’ P (A âˆ© C) âˆ’ P (B âˆ© C) + P (A âˆ© B âˆ© C)

Problem 3

Suppose that the events A and B are disjoint. Under what conditions are AC and BC disjoint?

Problem 4

Suppose that a committee of 12 people is selected in a random manner from a group of 100 people. Determine the probability that two particular people A and B will both be selected.

Problem 5

Consider an experiment in which a fair coin is tossed once and a balanced die is rolled once. â€¢ Describe the sample space for this experiment.

â€¢ What is the probability that a head will be obtained on the coin and an odd number will be obtained on the die?

Problem 6

Assuming that A and B are independent events, prove that the events AC and BC are also independent.

1

Problem 7

Problem set 1 May 29, 2020

Suppose that A, B, and C are three independent events such that P(A) = 1/4, P(B) = 1/3, and P(C) = 1/2.

â€¢ Determine the probability that none of these three events will occur.

â€¢ Determine the probability that exactly one of these three events will occur.

Problem 8

A box contains five coins with a head on each side, three coins with a tail on each side, and three fair coins. If one of these eleven coins is selected at random and tossed once, what is the probability that a head will be obtained?

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