If the normals at two points P and Q of a parabola y2 = 4ax intersect at a third point R on the curve, then the product of ordinates P and Q is :

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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?