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[" 13.Let "(1+x^(2))^(2)(1+x)^(n)=sum(k=...

[" 13.Let "(1+x^(2))^(2)(1+x)^(n)=sum_(k=0)^(n+4)a_(k)x^(k)" .If "a_(1),a_(2)" and "a_(3)" are in arithmetic progression,then "],[n" is "],[[" A) "6," B) "4," C) "9," D) "7]]

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