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3,6,9,...,996 -->n=996/3=332
yg habis dibagi 5
5,10,15,…,995 -->n=995/5=199
yg habis dibagi 3 dan 5
15,30,45,…,990 --->n=990/15=66
banyak bilangan yg tidak habis dibagi 3 atau 5 :
n=banyak bil asli kurang dari 999 - kelipatan 3- kelipatan 5 + bilangan ganda
n=998-332-199+66=533