# If two fair coins are flipped and at least one of the outcomes is known to be a head, what is the probability that both outcomes are heads?

68 views
in Computer
closed

If two fair coins are flipped and at least one of the outcomes is known to be a head, what is the probability that both outcomes are heads?

(A) 1/3

(B) 1/4

(C) 1/2

(D) 2/3

+1 vote
by (45.3k points)
selected

Correct option is (A) 1/3

Sample space = {HH,HT, TH}

Required probability = 1/3