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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

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Best answer

Correct option is (A) 1/3

Sample space = {HH,HT, TH} 

Required probability = 1/3

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