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an unbiased coin is tossed 3 times. find the probability that the coin lands heads exactly once.
14 years ago

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Answered by PsyDAG
n = # of things to choose from and r = # that you choose.

5! = 5 factorial = 5*4*3*2*1 = 120

nCr = n!/r!(n-r)!
14 years ago
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an unbiased coin is tossed 3 times. find the probability that the coin lands heads exactly once.

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