Discussion
Find the Harmonic Mean (H.M.) between 4 and 6.
Answer: B
\[ \text{H.M.} = \frac{2ab}{a+b} = \frac{2 \times 4 \times 6}{10} \]
\[ = \frac{48}{10} = 4.8 \]
The harmonic mean always falls below the arithmetic mean of 5.
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