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it is 18. 18 is a multiple of all three numbers. multiples of 3: 3,6,9,12,15,18... multiples of 6: 6,12,18... multiples of 9: 9, 18...18
some multiples are 25, 50, 75,100, 125, 150, 175, 200, 225, 250
there are infinite amount of common multiples.
1,5,25
18