Question

What is the greatest common divisor of $39$ and $91$?

Answer 1

13 is the greatest common divisor of 39 and 91.

`13 * 3 = 39 \\ \\ 13 * 7 = 91`

Answer 2

13

Explanation:

39 = 3·13

91 = 7·13

The only common factor is 13.

GCD(39, 91) = 13