solve (n(n+1)(2n+1)/6+Y^2)/(n+1) - [[n(n+1)/2 + Y]/(n+1)]^2 = (n^2 - 1)/12, Ysolve (n(n+1)(2n+1)/6+Y^2)/(n+1) - [[n(n+1)/2 + Y]/(n+1)]^2 = (n^2 - 1)/12, Y

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