zxcvbnmas wrote:
If a fair die is rolled three times, what is the probability that a 3 occurs on at least one roll?
A) 25/36
B) 125/216
C) 91/216
D) 11/36
E) 36/216
We can use the following formula:
1 = P(at least one three) + P(no threes)
Let’s determine P(no threes):
5/6 x 5/6 x 5/6 = 125/216
Thus, P(at least one three) is 1 - 125/216 = 91/216.
Answer: C
