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  9. Q57

TNPSC Group-I 2017 · Question 57 of 71

a, b, c are in Harmonic Progression if their reciprocals 1/a, 1/b, 1/c are in Arithmetic Progression. What is x for which 3, x, 6 are in Harmonic Progression?

Aptitude

  1. A4 1/2
  2. B4Correct
  3. C5
  4. D5 1/2

Answer: B. 4

Explanation

1/3, 1/x, 1/6 in AP: 2/x = 1/2, so x = 4.

Source: TNPSC Group-I Prelims 2017 (GS1902) - Official Question Paper (scribd OCR, tick-marked answers)

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