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6/(1*2)+6/(2*3)+6/(3*4)+.+6/[n(n+1)] =6{1/(1*2)+1/(2*3)+6/(3*4)+.+1/[n(n+1)]} =6*[1-1/2+1/2-1/3+1/3-1/4+.+1/n-1/(n+1)] =6*[1-1/(n+1)] =6n/(n+1)
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