Multiples of 13
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13 and 19 are both prime numbers. Their only common factor is ' 1 '.
A factor tree of 78: 78 6 x 13 (2x3) x 13 Since 2, 3, and 13 are prime numbers, the factor tree is complete.
Both values are prime, thus we conclude that the GCF (and the only common factor) is 1.
As 13 is prime and is not a factor of 24, then they are relatively prime
The greatest common factor of the numbers 117 and 130 is 13.