The GCD of given numbers is 1.
factors of 8 are : | 1 , 2 , 4 , 8 |
factors of 13 are : | 1 , 13 |
factors of 39 are : | 1 , 3 , 13 , 39 |
factors of 42 are : | 1 , 2 , 3 , 6 , 7 , 14 , 21 , 42 |
factors of 48 are : | 1 , 2 , 3 , 4 , 6 , 8 , 12 , 16 , 24 , 48 |
We see that the Greatest Common Factor = 1.