The escape velocity from earth is 11.2 km/s. If a body is to be projected in a direction making an angle 45° to the vertical; then the escape velocity is(a) 11.2 × 2 km/s(b) 11.2 km/s(c) 11.2/√2 km/s(d) 11.2√2 km/s

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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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