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3,6,9,...,999
aritmetika
a= 3
b= 3
karena banyak bilangan berarti sama saja dgn suku ke berapakah 999
Un = a+(n-1)b
999= 3+(n-1)3
(n-1)3 = 996
(n-1) = 332
n = 333
jdi banyak bilangan yg bisa di bagi 3 antara 1 sampai 1000 ialah 333 .
maaf jika salah ^_^