1. If A, A2, and Az are three events and P(A, n Az ) = P(A, N A3 ) # 0 but P(A2 n A, ) = 0, show that P(at least one A,) = P(A,) + P(A2) + P(A,) - 2P(A, n A2 ) 2. Suppose that two balanced dice are tossed repeatedly and the sum of the uppermost faces is determined on each toss. What is the probability that we obtain a) A sum of 3 betore we obtain a sum of 7? b) A sum of 4 before we obtain a sum of 7? 141

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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1. If A1, A2, and Az are three events and P(A, n Az ) = P(A, N A3 ) # 0 but
P(A2 N Ay ) = 0, show that
P(at least one A,) = P(A, ) + P(A2 ) + P(A,) – 2P(A, n A2 )
2. Suppose that two balanced dice are tossed repeatedly and the sum of the
uppermost faces is determined on each toss. What is the probability that we
obtain
a) A sum of 3 betore we obtain a sum of 7?
b) A sum of 4 betore we obtain a sum of 7?
Transcribed Image Text:1. If A1, A2, and Az are three events and P(A, n Az ) = P(A, N A3 ) # 0 but P(A2 N Ay ) = 0, show that P(at least one A,) = P(A, ) + P(A2 ) + P(A,) – 2P(A, n A2 ) 2. Suppose that two balanced dice are tossed repeatedly and the sum of the uppermost faces is determined on each toss. What is the probability that we obtain a) A sum of 3 betore we obtain a sum of 7? b) A sum of 4 betore we obtain a sum of 7?
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