We are given several math problems in the image. Let's solve number 3: $A = (3, 4)$, $B = (1, 2, 3)$, what is $B \setminus A$?

1. Problem Description

We are given several math problems in the image. Let's solve number 3: $A = (3, 4)$, $B = (1, 2, 3)$, what is $B \setminus A$?

2. Solution Steps

The set $B \setminus A$ contains all elements that are in $B$ but not in $A$.

$A = \{3, 4\}$ and $B = \{1, 2, 3\}$.

The elements in $B$ are $1, 2, 3$.

The elements in $A$ are $3, 4$.

The common element in $A$ and $B$ is $3$.

Therefore, $B \setminus A = \{1, 2, 3\} \setminus \{3, 4\} = \{1, 2\}$.

3. Final Answer

$\{1, 2\}$