An urn contains 5 red and 4 white balls. Two balls are drawn in succession without replacement. If the second ball is white, what is the probability that the first ball was white? Probability = || (Type a fraction. Simplify your answer.)

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
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 5 red and 4 white balls. Two balls are drawn in succession without replacement. If the
second ball is white, what is the probability that the first ball was white?
Probability = | (Type a fraction. Simplify your answer.)
Transcribed Image Text:An urn contains 5 red and 4 white balls. Two balls are drawn in succession without replacement. If the second ball is white, what is the probability that the first ball was white? Probability = | (Type a fraction. Simplify your answer.)
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