The GCD of given numbers is 2.
factors of 12 are : | 1 , 2 , 3 , 4 , 6 , 12 |
factors of 14 are : | 1 , 2 , 7 , 14 |
factors of 20 are : | 1 , 2 , 4 , 5 , 10 , 20 |
We see that the Greatest Common Factor = 2.
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.