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Answered 2011-07-05 23:02:25

>>> 1:7 (or, if you like probability, 87.5%)

I disagree. There are four possible combinations of three tosses (where order does not matter):

HHH

HHT

HTT

TTT

Three of these combinations will show at least one head - only by throwing three tails will you not throw at least one head.

Thus, the probability of throwing at least one head in three flips is 75%.

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