Question

A bag of numbered lottery balls contains the numbers 1 through 40. What is the probability that a randomly selected ball will be a number that is not a multiple of 13?

Answer 1

37/40

Explanation:

There are 3 numbers between 1 and 40 that are a multiple of 13: 13,26,39.

So, your probability should be 40-3/40, = 37/40.

Answer 2

37/40

Explanation:

there are only 3 multiples under 50

13, 26, and 39

So that means that the probability is 37/40