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Un = a + (n-1)b
Un = 999
untuk b = 3
Un = 3 + 3n-3
999 = 3n
n = 333
untuk b = 5
Un = 5 + 5n-5
995 = 5n
n =199
Bilangan kelipatan 3 dan 5 = 999/15 = 66
n = 999 - (333 + 199 - 66)
n = 533