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a = 3
b = 7 - 3 = 4
Maka,
Un = a + (n - 1) b
U45 = a + (n - 1)b
U45 = 3 + (45 - 1)4
U45 = 3 + (44)4
U45 = 3 + 176
U45 = 179
Jadi suku ke-45 adalah 179
b = U2-U1 = 7-3 = 4
Un = a + (n-1)b
U45 = 3 + (45-1)4
= 3 + (44)4
= 3 + 176
= 179