The GCD of given numbers is 3.
factors of 18 are : | 1 , 2 , 3 , 6 , 9 , 18 |
factors of 201 are : | 1 , 3 , 67 , 201 |
We see that the Greatest Common Factor = 3.
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.