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x(1 + x + x^2 + ....+ x^4) x^10( 1 + x + x^2+ ...)^5

(1-x^5)/(1-x)* 1/(1-x)^5

= 1-x^5 *(1/(1-x)^6)

find the  coefficient of x^9

answer will be 14C9 - 9C4.

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