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[5^(2)],[underset r=1r=1^(oo)r_(r=1)^(t)r],[S],[" 15.Find the sum of the series "],[[1+2(1-x)+3(1-x)(1-2x)+cdots],[+n(1-x)(1-2x)(1-3x)cdots[1-(n-1)x]]],[" Tower,Circular Road,Ranchi-1,"]

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