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Solution: Find the probability that one ball is white and one ball is black

Find the probability that one ball is white and one ball is black.

Problem Statement: EE Board October 1990

From a bag containing 4 black balls and 5 white balls, two balls are drawn one at a time. Find the probability that one ball is white and one ball is black. Assume that the first ball is returned before the second ball is drawn.

Problem Answer:

The probability that one ball is white and one ball is black is 40/81.

Solution:

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