The distance of two planets from the sun are 1013 and 1012 metres respectively. The ratio of time periods of these two planet is
(a) 1/√10
(b) 100
(c) 10√10
(d) √10

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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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