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beda = 7
Un = a + (n - 1)b
169 = 8 + (n - 1)7
169 = 8 + 7n - 7
169 = 7n + 1
7n + 1 = 169
7n = 169 - 1
7n = 168
n = 168/7
n = 24
Jadi, 169 adalah suku ke-24