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396 = n/2 (2(1) + (n - 1)7)
396 = n/2 (2 + 7n - 7)
396 = n/2 (7n - 5)
396 = (7n² - 5n) / 2
792 = 7n² - 5n
7n² - 5n - 792 = 0
(n - 11)(7n + 72)
n = 11 dan n = -72/7
ambil yang positif,
n = 11