n urn contains 15 balls: 4 red balls, 5 blue balls, and 6 green balls. (a) If three balls are drawn with replacement, what is the probability that all three balls are the same colour? (b) If three balls are drawn without replacement, what is the probability that all three balls are different colours?

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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An urn contains 15 balls: 4 red balls, 5 blue balls, and 6 green balls.
(a) If three balls are drawn with replacement, what is the probability that all three balls are the same
colour?
(b) If three balls are drawn without replacement, what is the probability that all three balls are
different colours?
Transcribed Image Text:An urn contains 15 balls: 4 red balls, 5 blue balls, and 6 green balls. (a) If three balls are drawn with replacement, what is the probability that all three balls are the same colour? (b) If three balls are drawn without replacement, what is the probability that all three balls are different colours?
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