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Problem-Solving By Substitution
Interchange Of Signs And Numbers

Given that ? = ×, ? = ÷, ? = +, and ? = -, evaluate the expression 6 ? 4 ? 2 ? 3 ? 1.

Answer: B. 20
Following BODMAS: 6 + 4 ÷ 2 × 3 - 1 = 20.
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