if a is an integer and P(a,a^2) is a point in the interior of quadrilateral x=0,y=0,4x+y-21=0 and 3x+y-4=0 and (1+a1x)^n=1+8x+24x^2+... then a is

A.a1

B.-a1

C.a1^2

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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?