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

find the coefficient of x52 ??

in Mathematical Logic 170 views
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1680 ??
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Do you understand the second solution here http://math.stackexchange.com/questions/305328/finding-coefficient-of-generating-function Its the same problem.

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I know the ans...plz give complete solution ...

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Best answer

aa

ans is 204 

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


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Thanks!
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@sonam,and one more thing,as far as i know,genral  term according to binomial formula in (1-x)n = n+r-1C r but here (1-x)n is in denominator..so why have u not taken minus??

please help me :-(

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there is table given in chapter 6.4 page 429(rosen book) ..refer from there

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