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  1. M

    Double Factorial

    Tnx :)
  2. M

    Double Factorial

    How?
  3. M

    Double Factorial

    How to prove (2n)!!=2^nn! for example (2)!!=2^11!=2 (4)!!=2^22!=8 ... (2n)!!=2n(2n-2)(2n-4)...=2^3n(n-1)(n-2)... I see that by intiution but I don't know how to write prove.
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