Question

You are rolling two dice at the same time. What is the probability of rolling a sum of 5 or 9?

Answer 1

C

Explanation:

To find the probability we use the mutually exclusive probability formula P(A) + P(B). The probability of getting a sum of 5 is

1 /9

and the probability of getting a sum of 9 is

1 /9

. The sum is

2 /9

Answer 2

You can get a 5 by rolling :
1 and 4
2 and 3
3 and 2
4 and 1

You can get a 9 by rolling :
3 and 6
4 and 5
5 and 4
6 and 3

There are 36 possible outcomes, hence your probability is
`(4\cdot2)/(36)=\boxed{\frac29}`