A bad contains 8 black, 3red and 9 white balls. If 3 balls are drawn at random, find the probability that none is red

Argument

You have a total of 8 + 9 + 3 balls = 20

The first ball is 17/20 Probability that no ball drawn is red the first time

The Second ball is 16/19 Probability that no ball drawn is red the 2nd time

The third ball is 15/18 Probability that no ball drawn is red the 3rd time

Answer

Total Probability = 17/20 * 16/19 * 15/18 = 34/57

My calculator figures out fractions. You can do this just as easily with decimals.

0.85 * 0.8421 * 0.8333333 = 0.5964

34/57 = 0.5965 which is close enough.

If you have choices, choose the one that coincides with my answer. Otherwise use the decimal value.