Set \( n(n+2) = 210 \), \( n^2 + 2n - 210 = 0 \), \( n = \frac{-2 \pm \sqrt{4 + 840}}{2} = \frac{-2 \pm \sqrt{844}}{2} \).

Mon, 04 May 2026 16:50:36 +0000

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