spinner has equal regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?

Question

spinner has equal regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?

Answer 1

List the numbers that are even numbers: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20

List the numbers that are multiples of 3 that aren't in the 1st list: 3, 9, 15, 21

Count the total number of items in both lists: 14.

Probability = 14/21 = 2/3