A Bird Flies for 4secs with a Velocity of (t-2)m/s in a Straight line, where t = time in secs. It Covers a Distance of ?(a)2m (b)4m(c)6m(d)8mWant Answer with Detailed Explaination if Possible. Thanks :)

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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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