Question

A number is chosen at random from the first 20 integers. Find the probability that the number is a multiple of 3.

Answer 1

3/10

Explanation:

Multiples of 3: 3,6,9,12,15,18

There are 6 in the numbers 1-20

P(multiple of 3) = number of "multiples of 3" / total

= 6/20

=3/10