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Math Help - combinatorics I guess!

  1. #1
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    Wink combinatorics I guess!

    okay umm.. I am new at this website and I need help in math!
    I was wondering if you guys cantell me if I am doing my work right?

    here it is:

    express each of the following as a product:

    a.6!

    my work:
    720

    6!=6x5x4x3x2x1

    or on my calculator:
    6 math-->prb-->4--> enter= 720


    b. 7C 2

    how would i do this one? thanks for your help in advance!
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  2. #2
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    Quote Originally Posted by justin View Post
    okay umm.. I am new at this website and I need help in math!
    I was wondering if you guys cantell me if I am doing my work right?

    here it is:

    express each of the following as a product:

    a.6!

    my work:
    720

    6!=6x5x4x3x2x1

    or on my calculator:
    6 math-->prb-->4--> enter= 720


    b. 7C 2

    how would i do this one? thanks for your help in advance!
    The first one is correct.
    The second one is,
    \frac{7!}{2!(7-2)!}
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