SOLUTION: A person tosses a coin 20 times. In how many ways can he get exactly 13 tails?

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Question 462597: A person tosses a coin 20 times. In how many ways can he get exactly 13 tails?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A person tosses a coin 20 times. In how many ways can he get exactly 13 tails?
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P(x = 13) = 20C13(1/2)^13*(1/2)^7
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= 77520/2^20
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Cheers,
Stan H.