If the 3rd and the `9^(t h)`terms of an AP are 4 and `- 8` respectively, which term of this AP is zero?

Explanation

To solve the problem step by step, we will use the properties of Arithmetic Progressions (AP).

### Step 1: Understand the terms of the AP
The nth term of an AP can be expressed as:
\[ T_n = a + (n - 1) \cdot d \]
where:
- \( T_n \) is the nth term,
- \( a \) is the first term,
...