$\text{A, B, C}$ are three numbers.
Let $@ \text{(A, B)} =$ average of $\text{A}$ and $\text{B}$,
$/ \text{(A, B)} = $ product of $\text{A}$ and $\text{B}$, and
$\text{X(A, B)} = $ the result of dividing $\text{A}$ by $\text{B}$
The sum of $\text{A}$ and $\text{B}$ is given by
- $/(@\text{(A, B)}, 2)$
- $X(@\text{(A, B)}, 2)$
- $@(/\text{(A, B)}, 2)$
- $@(X\text{(A, B)}, 2)$