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?

If two fair coins are flipped and at least one of the outcomes is know

1.	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» B. 1/4

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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?

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