Free GMAT Practice Question

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ID: GMAT-QR-PS-063
Section: Quantitative Reasoning - Problem Solving (PS)
Topic: Expressions
Difficulty level: Easy

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If $a$, $b$ and $c$ are nonzero numbers with $c\ne a$ and $\dfrac{1}{a}=\dfrac{1}{b}+\dfrac{1}{c}$, which of the following expresses $b$ in terms of $a$ and $c$?

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