The factors of 84 are:
1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
The factors of 108 are:
1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 108
The common factors are:
1, 2, 3, 4, 6, 12
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The LCM of 60, 84 and 108 is 3780.
The common factors of those numbers are 1, 2, 3, 4, 6, 12 The number that they are common factors of is 7560.
The greatest common factor of the numbers 84, 108 and 60 is 12.
The common factors are: 1, 2, 4, 8, 16.
Since 12 is a factor of 84, all of its factors are common.