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

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.

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:

Online Questions and Answers in Venn Diagram, Permutation, Combination and Probability


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