Show that the sequence defined by `a_n=5n-7` is an A.P., find its common difference.

Explanation

To show that the sequence defined by \( a_n = 5n - 7 \) is an arithmetic progression (A.P.) and to find its common difference, we can follow these steps:

### Step 1: Define the sequence
The sequence is given by the formula:
\[ a_n = 5n - 7 \]
where \( n \) is a positive integer.
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