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OpenStudy (anonymous):
A fair coin is tossed twice and we are told that at least one of the tosses is a head. What is the probability that both tosses are heads?
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OpenStudy (anonymous):
1/2
OpenStudy (jamesj):
If one of the tosses is a head, there are three possible combinations of outcomes HT TH HH Hence the probability that both are heads is 1/3.
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