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maths

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For how many ordered pairs of positive integers n and k with n and k less than or equal to 20, is the number
((2n)!(2k)!) / (n!k!(n+k)!) an integer?

  • maths - ,

    yr pls someone solve it.....

  • maths - ,

    No-one will solve it for you you cheat!!! Copying questions from Brilliant huh? Lame, lame!!!

  • maths - ,

    so whats ur problem i mean usmey aapko problem kya hai..?

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