harmonic progression

Question

The harmonic mean of 2 and 8 is

RankGuru · Accepted Answer

1. **Formula for HM**: $HM = \frac{2ab}{a + b}$.
2. **Identify Data**: $a = 2, b = 8$.
3. **Substitution**:
   - $HM = \frac{2(2)(8)}{2 + 8} = \frac{32}{10}$
4. **Result**: 3.2.

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If a, b, c are in HP, then b equals