Step 1:

From the figure, the number of elements in set $\"\"$ is $\"\"$ .

The number of elements in set $\"\"$ is $\"\"$ and $\"\"$ .

Counting formula: If $\"\"$ and $\"\"$ are two finite sets, then $\"\"$ .

Substitute $\"\"$ , $\"\"$ and $\"\"$ in above formula.

Number of $\"\"$ or $\"\"$ is represented as $\"\"$ .

$\"\"$

Solution:

Number of $\"\"$ or $\"\"$ is $\"\"$ . \ \