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In the experiment of tossing a fair coin 3 times, the sample space is made of the

following 8 equiprobable events: S = {HHH, THH, HTH, HHT, TTH, THT, HTT, TTT}.

The events that at least have one head are 7. So the probability of getting at least

one head on three tosses is: P(at least one H) = 7/8 = 0.875 = 87.5%

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Q: What is the probability of getting at least one head on three tosses of a coin?
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