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TNPSC Group 1 · 2017 Preliminary Examination

165.  \(a,\ b,\ c\) are said to be in Harmonic Progression if their reciprocals \(\dfrac{1}{a},\ \dfrac{1}{b},\ \dfrac{1}{c}\) are in Arithmetic progression. What would be the value of \(x\) for which \(3,\ x,\ 6\) are in Harmonic Progression.

Answer: B.   \(4\)
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