Which term of the AP : 121, 117, 113, . . ., is its first negative term?[Hint : Find n for `a_n<0`]

Explanation

To find the first negative term of the arithmetic progression (AP) given by 121, 117, 113, ..., we can follow these steps:

### Step 1: Identify the first term and common difference
The first term \( a \) of the AP is 121, and the common difference \( d \) can be calculated as:
\[ d = 117 - 121 = -4 \]

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