GATE | GATE CS 2011 | Question 3

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

Answer: (A)

Explanation: Since we know one outcome is head, there are only three possibilities {h, t}, {h, h}, {t, h}

The probability of both heads = 1/3

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