To figure this question out you have to list the multiplication facts:
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3: 0,3,6,9,I12I,15,18,21.......
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4: 0,4,8,I12,I16,20,24,28,32,36....
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O look i found a common denominator. 12. It wont be 0. it will be 12. (the __
I I
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is a box.) Hope this helps!