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x31⋅(1−x16)⋅(1−x15)⋅(1−x26)⋅$\frac{1}{(1-x)^{3}}$ 

find the coefficient of x52 ??

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aa

ans is 204 

https://gateoverflow.in//85604/generalized-permutation-and-combination( see the note  for more clearification )

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