Question

A bag contains 6 red balls, 7 green balls, 8 blue balls, 9 white balls.

If three balls are taken without replacement, determine the probability that they are the same colour.

Answer 1

The probability that three balls are the same color is: 6/30 * 5/29 * 4/28 + 7/30 * 6/29 * 5/28 + 8/30 * 7/29 * 6/28 + 9/30 * 8/29 * 7/28 = 0.0709 or 7.09%.