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Help me in combinatorics

Find out the co-efficient of \(x^n\) of the following expression:
\((1+x+x^2+x^3+........................+x^r)^n\)

Note by Fazla Rabbi
3 years, 11 months ago

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The exponentials are just there to trick you.

Daniel Leong - 3 years, 11 months ago

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