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Problem-Solving By Substitution
Interchange Of Signs And Numbers

Using the symbols '?' for multiplication, '?' for division, '?' for addition, and '?' for subtraction, evaluate 5 ? 3 ? 15 ? 2 ? 1.

Answer: A. 14
Following BODMAS: (5 * 3) / 15 + 2 - 1 = 15 / 15 + 2 - 1 = 1 + 2 - 1 = 2.
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