the coefficient of x^18 in the polynomial (1+x)^20+x(1+x)^19+x^2(1+x)18+...+x^18(1+x)^2
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the coefficient of x^18 in the polynomial (1+x)^20+x(1+x)^19+x^2(1+x)18+...+x^18(1+x)^2 is (1+x)^2.
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