The factors of 15 are:
1, 3, 5, 15
The factors of 29 are:
1, 29
The common factors are: 1
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Both 23 and 29 are prime; their only factors are 1 and themselves. Therefore, the greatest common factor is 1.
Just 1.
If there is no factor that both of the numbers share (and there is not because they are both prime), then the answer is one. Every number has a factor of one, because every number times one is itself.
The only factors of 29 are ' 1 ' and ' 29 '.The only factor it has in common with 62, and therefore their greatest common factor, is ' 1 '.
The greatest common factor of 46 and 69 is 23.