[" 3."sum(k=1)^(2n+1)(-1)^(k-1).k^(2)=],...

[" 3."sum_(k=1)^(2n+1)(-1)^(k-1).k^(2)=],[[" 1) "(n+1)(2n+1)," 2) "(n+1)(2n-1)," 3) "(n-1)(2n-1)," 4) "(n-1)(2n+1)]]

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