A lift weighing 1000 kg is moving upwards with an accelertion of 1 m/s². The tension in the supporting cable is

(a) 980 N

(b) 10800 N

(c) 9800 N

(d) 8800 N

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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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