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A fair coin is flipped 7 times. What is the probability that at least 5 of the flips come up heads? Give your answer as a simplified fraction.

 Jun 29, 2020
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At least 5 heads out of 7 flips:

The probability is:

(7 nCr 5)+(7 nCr 6)+(7 nCr 7) / 2^7 =29 / 128

 Jun 29, 2020

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