("lim")(xvec1)((1-x)(1-x^2)(1-x^(2n)))/(...

`("lim")_(xvec1)((1-x)(1-x^2)(1-x^(2n)))/({(1-x)(1-x^2)(1-x^n)}^2),n in N ,e q u a l s` `^2n P_n` (b) `^2n C_n` (c) `(2n)!` (d) none of these

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