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13 September, 19:32

How many different committees of 4 people can be chosen from a group of 21? 143,640 5,985 1,9955

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  1. 13 September, 19:44
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    This is a combination - nCr = n! / (n-r) ! r!

    21! / (21-4) !4! =

    21!/17!4! =

    (21•20•19•18•17!) / 17!•4•3•2 =

    145640/24 =

    5985
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