Which term of the sequence `20 ,\ \ 19 1/4,\ \ 18 1/2,\ \ 17 3/4,\ dot` is the first negative term?

Explanation

To find the first negative term of the sequence \(20, 19 \frac{1}{4}, 18 \frac{1}{2}, 17 \frac{3}{4}, \ldots\), we can follow these steps:

### Step 1: Identify the sequence type
The given sequence appears to be an arithmetic progression (AP). We need to confirm this by calculating the common difference between consecutive terms.

### Step 2: Calculate the common difference
1. The first term \(a_1 = 20\).
2. The second term \(a_2 = 19 \frac{1}{4} = \frac{77}{4}\).
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