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Posted by 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.

  • math - , Monday, February 28, 2011 at 11:06am

    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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