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[" 22.The coefficient of "x^(18)" in "],...

[" 22.The coefficient of "x^(18)" in "],[(1+x+2x^(2)+3x^(3)+...+18x^(18))^(2)]

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Coefficient of x^(18) in (1+x+2x^2+3x^3++18 x^(18))^2 equal to 995 b. 1005 c. 1235 d. none of these

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The coefficient of x^(17) in the expansion of (x-1)(x-2)……..(x-18) is