E, m, J and G denote energy, mass, angular momentum and gravitational constant respectively, then the dimensions of (EJ^2)/(m^5 G^2 ) are that of
(a) Angle
(b) Length
(c) Mass
(d) Time

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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?

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