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posted by Anonymous on Sunday, February 27, 2011 at 2:11pm.
an unbiased coin is tossed 3 times. find the probability that the coin lands heads exactly once.
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)!
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