if the coordinates of a point moving with constant acceleration be x1 x2 x3 at the instant t1 t2 t3 respectively prove that the acceleration is 2 {(x2-x3)t1+ (x3-x1)t2+(x1-x2)t3}/(t2-t3)((t3-t1)(t1-t2)

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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?