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Math Help - Combination

  1. #1
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    Combination

    Combination-c.jpg
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  2. #2
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    Re: Combination

    Hey lavacelava.

    What have you tried?

    Hint: Try expanding out in terms of factorial expressions so that you get an expression in terms of n.
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  3. #3
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    Re: Combination

    I've done only this
    Combination-com.jpg
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  4. #4
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    Re: Combination

    nC3 = n!/[3!*(n-3)!]
    (n-1)C3 = (n-1)!/[3!*(n-4)!]

    nC3/(n-1)C3 = (n!/[n-1]!) * (n-4)!/(n-3)!

    Hint: n! = n*(n-1)! = n*(n-1)*(n-2)! = n*(n-1)*(n-2)*(n-3)! = n*(n-1)*(n-2)*(n-3)*(n-4)!
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  5. #5
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    Re: Combination

    Combination-05-jul-13.png
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