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March 26, 2017

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Assume that the set S has 14 elements.
How many subsets of S have at most 4 elements?

  • math - ,

    null set --- 1
    one element --- C(14,1) = 14
    two elements --- C(14,2) = 91
    three elements --- C(14,3) = 364
    four elements --- C(14,4) = 1001

    add them up.

  • math - ,

    ^no, I just tried it and it isn't right. any other suggestions?

  • math - ,

    Got it:

    C(14,0)+C(14,1)+C(14,3)+C(14,4)=answer

    I hate webwork.......

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