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[" 9."lim(x rarr1)((1-x)(1-x^(2))...(1-x...

[" 9."lim_(x rarr1)((1-x)(1-x^(2))...(1-x^(2n)))/({(1-x)(1-x^(2))...(1-x^(n))}^(2))],[[" (a) "2nP_(n)," (b) "^(2n)C_(n)],[" (c) "(2n)!," (d) none of these "]]

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