If a cricketer catches a ball of mass 150 gill moving with a velocity of 20 m is, then he experiences a force of (Time taken to complete the catch is 0.1 sec.)(a) 300N(b) 30N(c) 3N(d) 0.3N

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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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