Question

The numbers 1 through 20 are written on ping pong balls and placed into a bin. One ping

pong ball is drawn. Find the probability that you draw an even number or a 3.

Answer 1

11/20

Explanation:

P(even #) = 1/2

P(3) = 1/20

add both probabilities: 10/20 + 1/20 = 11/20