Step 1:
Given that $a, b, c$ are in Harmonic Progression (HP), we can write the condition for HP as:
\[ \frac{1}{b} - \frac{1}{a} = \frac{1}{c} - \frac{1}{b} \]
Solving this, we get:
\[ b - \frac{a}{b} = c - \frac{b}{c} \]
Simplifying, we get:
\[ ab - a = bc - b
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