Prove that (2n)!/n!=1x3x5...............(2-1)x2^n ?

Prove that (2n)!/n!=1x3x5...............(2-1)x2^n ?

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  • Anonymous
    8 years ago
    Favourite answer

    (2n)! = (2n) X (2n-1) X (2n-2) X (2n-3) X (2n-4) X ... X 3 X 2 X 1

    = (2n-1) X (2n-3) X (2n-5) X ... X 3 X 1

    X 2(n) X 2(n-1) X 2(n-2) X 2(n-3) X ...X 2 X 1

    = (2n-1) X (2n-3) X (2n-5) X ... X3X1

    X 2^n X n!

    So (2n)!/n! is 2^n times (2n-1)X(2n-3)X...X3X1

  • Anonymous
    8 years ago

    It looks like Yahoo cut of your formula. Please add the rest of it. You need to include some spacee. If a "word" is too long it won't all be shown.

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