The GCD of given numbers is 1.
| factors of 1236 are : | 1 , 2 , 3 , 4 , 6 , 12 , 103 , 206 , 309 , 412 , 618 , 1236 |
| factors of 61 are : | 1 , 61 |
We see that the Greatest Common Factor = 1.
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.