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8 November, 21:20

An election ballot asks voters to select six city commissioners from a group of 15 candidates. in how many ways can this be done

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  1. 9 November, 00:44
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    N=total city commissioners r=how many candidates nCr=n!/[ (n-r) !*r!]!=factoral

    n=15 r=6

    nCr=15!/[ (15-6) !*6!]

    nCr=1307674368000/362880 (720)

    nCr=1307674368000/261273600

    nCr=5005
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