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The answer is 9. Here is why. In PE(MD)(AS), MD and AS are done on the same step, left to right. 2(1+2) is the M step, but you have to solve the parentheses first. That equals (3), but before you can multiply it by the rest of the equation, you have to solve the D step to the left of it first, 6/2. The equation becomes 3*(3), which equals 9.
