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I got to the following equation while going through a book. I can't figure out how the second line comes from the first. Can anyone please help me understand?

(1/2*\sum_{q=-Q}^Q V_s,q .H(w_q) .exp(iw_q t))^n is written as,

1/2^n * \sum_{q1=-Q}^Q \sum_{q2=-Q}^Q ....... \sum_{qn=-Q}^Q V_s,q1 . V_s,q2 .... V_s,qn .H(w_q1).H(w_q2).....H(w_qn).exp(i(w_q1 +w_q2 +....w_qn).t)

Please forgive my poor latex style writing.

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# Need help in explaining the calculation of n-th power of a summation

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