If the mth term of an A.P. be `1//n` and nth term be `1//m` then show that its (`m n` )th term is 1.

Explanation

To solve the problem, we need to show that if the m-th term of an A.P. (Arithmetic Progression) is \( \frac{1}{n} \) and the n-th term is \( \frac{1}{m} \), then the \( mn \)-th term is equal to 1.

### Step-by-Step Solution:

1. **Define the terms of the A.P.:**
Let the first term of the A.P. be \( a_1 \) and the common difference be \( d \).

2. **Write the expressions for the m-th and n-th terms:**
...