48.For a positive integer n let
1 1
2 3 4
a (n)1+
then
(2)
(b) a (100) 100
(d) a (200)100
(a) a (100)s 100
(c) a (200) s 100

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Sum of series 2[n/2] ! [n/2]!/ n! [2Co-2C2+3C2....+[-1]^n[n+1]2Cn] where n is an even positive integer. Kindly provide solution of this question and how to generalise this. How do we know that which expansion will give this?