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$\text{A, B, C}$ 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 $\text{B}$ 

Average of $\text{A, B}$ and $\text{C}$ is given by

  1. $@(/(@(/\text{(B, A)}, 2), \text{C)}, 3)$
  2. $\text{X(}@(/(@\text{(B, A)}, 3), \text{C)}, 2)$
  3. $/(@(\text{X(}@\text{(B, A)}, 2), \text{C)}, 3)$
  4. $/(\text{X(}@(/(@\text{(B, A)}, 2), \text{C)}, 3), 2)$
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