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Greater than what?
As every number has a factor of 1, there is always a common factor of 1 between any two numbers; if there are no other common factors then the greatest common factor of those numbers is 1.
The factors of 154 and 42 are:
154: 1, 2, 7, 11, 14, 22, 77, 154
42: 1, 2, 3, 6, 7, 14, 21, 42
Their common factors are: 1, 2, 7, 14
Therefore their greatest common factor is 14.
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