Question

A lottery game has balls numbered 1 through 21. What is the probability of selecting an even numbered ball or a 5?

Answer 1

11/21

Explanation:

There are 10 even numbers that lie between 1 and 21 (2,4,6,8,10,12,14,16,18, and 20). These 10 balls, plus the 5-ball equals a total of 11 balls that could get picked. Therefore, the probability of picking one of these balls is 11/21.