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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If '?' represents multiplication, '?' represents division, '?' represents addition, and '?' represents subtraction, what is the value of 6 ? 2 ? 3 ? 4 ? 1?

Answer: B. 16
Calculating: 6 * 2 / 3 + 4 - 1 = 12 / 3 + 4 - 1 = 4 + 4 - 1 = 7.
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