1, 2, 3, 4, 6, 12
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Since 12 is a factor of 84, all of its factors are common.
1,2,3,4,6,8,9,12,18,24,36,72 1,2,3,4,6,7,12,14,21,28,42,84
The common multiples of 18 and 72 are 72, 144, 216, 288, 360, 432, 504, 576, 648, 720, and so on. Anything divisible by 72 is divisible by 18 since 18 is one of the factors of 72.
The common factors are: 1, 7
6