Question 28 - Math Practice Test for the PSAT/NMSQT Exam

If \(a=\dfrac{1}{b}+\dfrac{2}{c}\) what is \(c\) in terms of \(a\) and \(b\)?

\[\dfrac{2(1-ab)}{a}\]
\[\dfrac{2}{ab-1}\]
\[c=\dfrac{2b}{ab-1}\]
\[\dfrac{2ab}{1-ab}\]

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