If a fair die is rolled twice and two numbers X = result of the first roll and X2= result of the second roll are obtained. Given that X1 +X2 = 7, what is the probability that X1 = 4 or X2 = 4?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
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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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If a fair die is rolled twice and two numbers X1= result of the first roll and X2=
result of the second roll are obtained. Given that X1+ X2 = 7,what is the
probability that X1 = 4 or X2 = 4?
Transcribed Image Text:EXERCISE If a fair die is rolled twice and two numbers X1= result of the first roll and X2= result of the second roll are obtained. Given that X1+ X2 = 7,what is the probability that X1 = 4 or X2 = 4?
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