Moderate
The Harmonic Mean of any two numbers is________________?
Correct answer: B. 2aba+b
- A. a+b2
- B. 2aba+b
- C. ab−−√
- D. a+b
Explanation
For two positive numbers, the harmonic mean is the reciprocal of the average of their reciprocals: 2ab divided by a+b. Thus option b gives the required formula.
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