Question

If A and B are finite sets, the Counting Formula states that$n\left(A\cup B\right)=$______.

Short answer

$n\left(A\cup B\right)=n\left(A\right)+n\left(B\right)-n\left(A\cap B\right)$.

Step-by-step solution

Step 1. Given Information.

If A and B are finite sets, the Counting Formula states that$n\left(A\cup B\right)=$______.

Step 2. Fill up.

If A and B are finite sets, the Counting Formula states that$n\left(A\cup B\right)=n\left(A\right)+n\left(B\right)-n\left(A\cap B\right)$.