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Faktor 140 = 1,2,4,5,7,10,14,20,28,35,70,140
Faktor 90 = 1,2,3,5,6,9,10,15,18,30,45,90
Faktor persekutuan(90,140,210) = semua angka ada di ketiga deretan faktor tersebut yaitu 1,2,5 dan 10
semoga membantu :D