The GCD of given numbers is 17.
| factors of 68 are : | 1 , 2 , 4 , 17 , 34 , 68 |
| factors of 901 are : | 1 , 17 , 53 , 901 |
We see that the Greatest Common Factor = 17.
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.