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show that logx,logx^2,logx^3,logx^4...is n(n+1)logx/2
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1+2+3+...= n(n+1)/2
logx + logx^2 + ... + logx^n = 1logs + 2logx + ... + n logx
= (1+2+3+...+n)logx
= n(n+1)/2 logx
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