Question

A golf ball is selected at random from a golf bag. If the golf bag contains 7 type A​ balls, 4 type B​ balls, and 9 type C​ balls, find the probability that the golf ball is not a type A ball.

what is the probability that the golf ball is not a type A ball?

Answer 1

11/20

Explanation:

the probability for all = 7+4+9 = 20

the probability that the golf ball is not a type A ball = the probability of type B + the probability of type C

= 7/20 + 4/20

= 11/20