The GCD of given numbers is 1.
factors of 280 are : | 1 , 2 , 4 , 5 , 7 , 8 , 10 , 14 , 20 , 28 , 35 , 40 , 56 , 70 , 140 , 280 |
factors of 117 are : | 1 , 3 , 9 , 13 , 39 , 117 |
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.