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12 = 2² x 3
18 = 2 x 3²
24 = 2³ x 3
KPK = 2³ x 3²
KPK = 8 x 9
KPK = 72
Maka, setiap 72 detik sekali ketiga lampu itu menyala bersamaan
18= 2x3x3
24= 2x2x2x3
Kpk= 2x2x2x3x3=72 detik