12 is.
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3 is the greatest number which divides 9, 12 and 15.Factors of 9: 1, 3 and 9.Factors of 12: 1, 2, 3, 4, 6 and 12.Factors of 15: 1, 3, 5 and 15.So, G.C.F. is 3.
3, 6, 9, 12 and 15
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39 . . .
The factors of 9 are 1, 3 and 9. The factors of 15 are 1, 3, 5 and 15. The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30.
The Least Common Multiple (LCM) for 3 9 18 15 25 75 9 12 15 4 7 10 6 7 9 is 6,300.