The GCD of given numbers is 71.
Step 1 : Find prime factorization of each number.
$$\begin{aligned}71 =& 71\\[8pt]71 =& 71\\[8pt]\end{aligned}$$(view steps on how to factor 71 and 71. )
Step 2 : Put a box around factors that are common for all numbers:
$$\begin{aligned}71 =& \color{blue}{\boxed{71}}\\[8pt]71 =& \color{blue}{\boxed{71}}\\[8pt]\end{aligned}$$Step 3 : Multiply the boxed numbers together:
$$ GCD = 71 $$This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.