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Find the sum of the first 20terms of the A.P. logx,logx^2,logx^3,logx^4

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note that the sequence is
1logx + 2logx + 3logx + ... = logx(1+2+...+20)
So S20 = logx * 20*21/2 = 210 logx (for x > 0 ... why?)

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