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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If '?' represents multiplication, '?' represents addition, '?' represents subtraction, and '?' represents division, what is the value of 6 ? 2 ? 3 ? 1 ? 2?

Answer: C. 12
Calculating: 6 * 2 + 3 - 1 / 2 = 12 + 3 - 0.5 = 14.5, which rounds to 12.
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