The GCD of given numbers is 190.
Step 1 : Find prime factorization of each number.
$$\begin{aligned}950 =& 2\cdot5\cdot5\cdot19\\[8pt]2090 =& 2\cdot5\cdot11\cdot19\\[8pt]1330 =& 2\cdot5\cdot7\cdot19\\[8pt]\end{aligned}$$(view steps on how to factor 950, 2090 and 1330. )
Step 2 : Put a box around factors that are common for all numbers:
$$\begin{aligned}950 =& \color{blue}{\boxed{2}}\cdot\color{red}{\boxed{5}}\cdot5\cdot\color{Fuchsia}{\boxed{19}}\\[8pt]2090 =& \color{blue}{\boxed{2}}\cdot\color{red}{\boxed{5}}\cdot11\cdot\color{Fuchsia}{\boxed{19}}\\[8pt]1330 =& \color{blue}{\boxed{2}}\cdot\color{red}{\boxed{5}}\cdot7\cdot\color{Fuchsia}{\boxed{19}}\\[8pt]\end{aligned}$$Step 3 : Multiply the boxed numbers together:
$$ GCD = 2\cdot5\cdot19 = 190 $$This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.