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[" 15."lim(x rarr oo)(1-2+3-4+5-6+cdots-...

[" 15."lim_(x rarr oo)(1-2+3-4+5-6+cdots-2n)/(sqrt(n^(2)+1)+sqrt(4n^(2)-1))" is equal to: "],[[" (a) "(1)/(3)," (b) "-(1)/(3)],[" (c) "-(1)/(5)," (d) None of these "]]

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