1.

lim_(xto-1) ((1+x)(1-x^2)(1+x^3) (1-x^4).......(1-x^4n))/([(1+x)(1-x^2)(1+x^3) (1-x^4) .....(1-x^2n)]^2) is equal to

Answer»

`.^(4n)C_(2n)`
`.^(2n)C_(N)`
`2.^(4n)C_(2n)`
`2.^(2n)C_(n)`

Answer :A


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