In an A.C. circuit with voltage V and current I the power dissipated is

(a) Dependent on the phase between V and I

(b) VI/sqrt(2)

(c) VI/2

(d) VI

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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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