The GCD of given numbers is 1.
| factors of 9 are : | 1 , 3 , 9 |
| factors of 30 are : | 1 , 2 , 3 , 5 , 6 , 10 , 15 , 30 |
| factors of 39 are : | 1 , 3 , 13 , 39 |
| factors of 49 are : | 1 , 7 , 49 |
| factors of 59 are : | 1 , 59 |
| factors of 21 are : | 1 , 3 , 7 , 21 |
We see that the Greatest Common Factor = 1.