The mth term of a H.P is `n` and the nth term is `m` . Proves that its rth term is `m n//rdot`

Explanation

To prove that the rth term of a Harmonic Progression (H.P) is \( \frac{mn}{r} \) given that the mth term is \( n \) and the nth term is \( m \), we can follow these steps:

### Step 1: Define the H.P.
Let the terms of the H.P. be represented as:
\[ \frac{1}{a}, \frac{1}{a + d}, \frac{1}{a + 2d}, \ldots \]
where \( a \) is the first term and \( d \) is the common difference.
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