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3 = 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, dan seterusnya
kelipatan 3 = 3,6,9,12,15,18,21,24,27,30 (ciri-ciri = jumlah semua angkanya bisa dibagi 3 , contoh 1221 = 1+2+2+1 = 6 bisa dibagi 3)