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4+8+12+... + 4n=2n(n+1)

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Panoyinidn
4 + 8 + 12 + 4n = 2n(n + 1)
            24 + 4n = 2n(n) + 2n(1)
            24 + 4n = 2n² + 2n
                   -2n            -2n
                    24 = 2n²
                    24 = 2n²
                     2      2
                    12 = n²
                  √12 = n
              √4 × 3 = n
               √4 √3 = n
                 2 √3 = n
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