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3 ÷ 1 = 3 ; 6 ÷ 2 = 3
12 ÷ 3 = 4 ; 16 ÷ 4 = 4
1, 2, 5, 6, 9, 10, 13, 14, 17, 18 kelipatan 3 dan 3, 4, 7, 8, 11, 12, 15, 16, 19, 20 kelipatan 4
maka, 20 × 4 = 80
jadi, lingkaran pada pola ke 20 ada 80