Karena kelipatan 2 dan 7 maka kelipatan 14 lah yang dicari
112, 126, 140, ..., 490
maka,
Un = a + (n - 1)b
490 = 112 + (n - 1)14
490 = 112 + 14n - 14
490 = 98 + 14n
14n = 392
n = 28
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Karena kelipatan 2 dan 7 maka kelipatan 14 lah yang dicari
112, 126, 140, ..., 490
maka,
Un = a + (n - 1)b
490 = 112 + (n - 1)14
490 = 112 + 14n - 14
490 = 98 + 14n
14n = 392
n = 28