If a, b, c are in HP, then `(a-b)/(b-c)` is equal to

Explanation

To solve the problem, we need to find the value of \((a-b)/(b-c)\) given that \(a\), \(b\), and \(c\) are in Harmonic Progression (HP).

### Step-by-Step Solution:

1. **Understanding Harmonic Progression (HP):**
If \(a\), \(b\), and \(c\) are in HP, then their reciprocals \(1/a\), \(1/b\), and \(1/c\) are in Arithmetic Progression (AP).

2. **Using the Property of AP:**
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