# 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.

#### 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.

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

Solution:

### Latest Problem Solving in Venn Diagram, Permutation, Combination and Probability

More Questions in: Venn Diagram, Permutation, Combination and Probability

#### Search! Type it and Hit Enter

 Accepting Contribution for Website Operation. Thanks! Option 1 : \$5 USD Option 2 : \$10 USD Option 3 : \$15 USD Option 4 : \$20 USD Option 5 : \$25 USD Option 6 : \$50 USD Option 7 : \$100 USD Option 8 : Other Amount