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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If '?' represents addition, '?' represents multiplication, '?' represents subtraction, and '?' represents division, find the value of 4 ? 2 ? 3 ? 1 ? 2.

Answer: B. 12
Substituting the symbols and applying BODMAS gives 4 × 2 + 3 - 1 ÷ 2 = 12.
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