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If you flip three fair coins what is the probability that the two first flips will both be heads, and the third flip will be either heads or tales?

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Answer:

The probability that a coin flip is a head or a tail is 0.5. The probability that a coin flip is either a head or a tail is 1. The probability that a three-coin-flip is two heads and a head or a tail is 0.25.

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