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It is: 6+12+18 = 36
The first 5 multiples of 3 are as follows: 3, 6, 9, 12, 15
The first five multiples of 6 are 6, 12, 18, 24 and 30. For them to be common, they need to be compared to another set of multiples.
0, 2, 4, 6, 8.0,2,4,6,8 are the first five multiples of 2
6, 12, 18, 24, 30