What is 3 $ (2 $ 1) if A $ B = A * B - ( A + B)?

The correct answer to this question is -5. This answer is found by using the order of operations of math. The acronym PEMDAS is used to represent the order. P stands for parentheses, E for exponents, M for multiplication, D for division, A for addition, and S for subtraction.

In school, the saying Please Excuse My Dear Aunt Sally is used to remember the order. Following the order of operations, the parenthetical values of this question are solved first. Once the costs in between the parentheses are addressed, the rest of the equation can be completed, which gives us the answer -5.