Question

use the rack of 15 billiard balls shown.
If one ball is selected at random, determine the odds in favor of it containing two digits.

Answer 1

are the billiard balls numbered 1 - 15 ?

Answer 2

yes they are

Answer 3

so there are 9 balls marked with 1 digit and 6 marked with 2 digit numbers.

Answer 4

yup

Answer 5

Probability to select a ball at random, and it having a 2 digits is (number of balls with 2 digits) / (total number of balls) = 6/15=2/5=0.4