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FP 25=5²
FP 50=2×5
KPK=5²×2×3=25×3×3=150 .
jadi ketiga lampu tersebut akan menyala bersamaan setiap 150 detik.
lampu merah : 3×5
lampu biru. : 5²
lampu hijau. : 2×5²
KPK= 2×3×5²
= 150 detik