Question

A pair of dice is rolled. What is the probability that the sum is 9 or that the first number is a 2? Please show you're work!

Answer 1

5/18

Explanation:

There are 36 possible outcomes

There are 6 with a 2 as the first roll

There are 4 with a sum of 9

P( sum is 9 or that the first number is a 2)

= sum is 9 or that the first number is a 2/total

( 6+4) / 36

=10/36

=5/18