The GCD of given numbers is 1.
| factors of 1 are : | 1 |
| factors of 2 are : | 1 , 2 |
| factors of 12 are : | 1 , 2 , 3 , 4 , 6 , 12 |
| factors of 30 are : | 1 , 2 , 3 , 5 , 6 , 10 , 15 , 30 |
| factors of 33 are : | 1 , 3 , 11 , 33 |
| factors of 6 are : | 1 , 2 , 3 , 6 |
We see that the Greatest Common Factor = 1.