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Question #87369
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Question
What is the correct expression for n₂₁ if n₁₂ is known?
A. n₂₁ = n₁₂
B. n₂₁ = 2n₁₂
C. n₂₁ = 1/n₁₂
D. n₂₁ = n₁₂²
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