In the arangement shown in the figure the block of m=2kg lies on the wedge of M=8kg.The initial acceleration of the wedge if the surfaces are smooth and pulley and strings are massless is 30(3)^(1/3)/x m/s^2 then x 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?