If n is an odd positive integer, show that `(n^2-1)` is divisible by 8.

Explanation

To show that \( n^2 - 1 \) is divisible by 8 when \( n \) is an odd positive integer, we can follow these steps:

### Step 1: Express \( n \) as an odd integer
An odd integer can be expressed in the form:
\[ n = 2k + 1 \]
where \( k \) is an integer.
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