You are going to roll two dice. Let the variable x = the sum of the numbers rolled.

Question

What is the probability that x = 9?

Answer 1

Of the 36 possible results of a throw of two dice, 4 add up to nine. They are 3+6, 4+5, 5+4 and 6+3.

So the probabability of throwing a nine is 4/36 = 1/9