Binomial Theorem

If Cr=nCr,the sum of the series
2[(n2)fact)2]nfact[C02-2C12+3C22-......(-1)n(n+1)2Cn2]
where n is even integer,is
(a)0 (b)(-1)n2.(n+1)
(c)(-1)n.(n+2) (d)(-1)n.n
(e)none of these
Ans is (e)..however..pls provide the solution

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