Question

A black die, a red die and a green die are thrown at the same time. What is the probability that the sum of three numbers that turn up is 15?

(A) 11/216

(B) 5/108

(C) 9/216

(D) 12 1/8

Answer 1

The correct option: (B) 5/108

Explanation:

Total number of outcomes when three dice are thrown = 6 x 6 x 6 = 216 

For sum of numbers to be 15, 

possible ways are, (6, 6, 3), (6, 3,6), (3, 6,6), (6, 5,4), (6,4, 5), (5,4, 6), (5, 6,4), (4, 5, 6), (4, 6, 5), (5, 5, 5) 

.'. Number of favorable outcomes = 10 

.'.  Required probability = 10/216 = 5/108