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[" 4The value of "lim(x rarr1)((x+x^(2)+...

[" 4The value of "lim_(x rarr1)((x+x^(2)+x^(3)+cdots+x^(n))-n)/(x-1)" is "],[[" a."(n+1)/(2)," b."(n(n+1))/(2)]]

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