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23 January, 17:59

Which expression represents the number of possible combinations of n items taken rat a time

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  1. 23 January, 21:43
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    nCr = n! / (r!) (n-r!).

    Step-by-step explanation:

    That would be nCr = n! / (r!) (n-r!).

    A quick way of working these out is as follows:

    Take 7C4:

    this is 7*6*5*4/4*3*2*1 Cancelling out the 4 and 3*2:

    = 7*5

    = 35.

    15C12 = 15C (15-12)

    = 15C3

    = 15*14*13 / 3*2*1

    = 5*7*13

    = 455.
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