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September 30th, 2016, 02:08 AM   #1
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Coefficient in binomial expansion

The coefficients of $x^9$ in the expansion of $(1+x)(1+x^2)(1+x^3)...........(1+x^{2016})$
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September 30th, 2016, 06:31 PM   #2
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9=9
1+8=9
2+7=9
3+6=9
4+5=9
1+2+6=9
1+3+5=9
2+3+4=9
8 items
Coefficient = 8.

Expansion is not binomial!
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