find the coefficient of x^n in the expansion(1+2x+3x^2+-)^2​

Question

find the coefficient of x^n in the expansion(1+2x+3x^2+….)^2​

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Ariana 3 weeks 2021-09-10T09:56:10+00:00 1 Answer 0 views 0

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    2021-09-10T09:57:48+00:00

    coefficient of xn in the expansion is n2 +2n + 1

    please mark as brainliest.

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