In the expansion of

MATHEMATICS · Single correct · CBSE · Mathematics · Polynomials · Polynomials

Problem

In the expansion of (x)(x+x2)⋯(x+x2+⋯+x2n)\left(x\right)\left(x+x^2\right)\cdots\left(x+x^2+\cdots+x^{2n}\right), the sum of the coefficients is (1) 1 (2) (2n)!(2n)! (3) (2n)!+1(2n)!+1 (4) (2n+1)!(2n+1)!

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