Question

• You roll two standard number cubes.

What is the probability of rolling a 3 on
one cube, but not both cubes?

Answer 1

5/18

Explanation:

There are two ways this can happen: you roll a 3 on the first cube and not a 3 on the second cube, or you roll not a 3 on the first cube and 3 on the second cube.

P = (1/6)(5/6) + (5/6)(1/6)

P = 5/36 + 5/36

P = 10/36

P = 5/18