Write first four terms of the A. P., when the first term a and the common difference d are given as follows :
`a = - 1.25 , d = - 0.25`

Answer

To find the first four terms of the Arithmetic Progression (A.P.) given the first term \( a \) and the common difference \( d \), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the first term and common difference**:
- Given \( a = -1.25 \) (first term)
- Given \( d = -0.25 \) (common difference)

2. **Use the formula for the \( n \)-th term of an A.P.**:
The \( n \)-th term of an A.P. can be calculated using the formula:
\[ a_n = a + (n - 1) \cdot d \]

3. **Calculate the first term \( a_1 \)**:
- For \( n = 1 \):
\[ a_1 = a + (1 - 1) \cdot d = -1.25 + 0 = -1.25 \]

4. **Calculate the second term \( a_2 \)**:
- For \( n = 2 \):
\[ a_2 = a + (2 - 1) \cdot d = -1.25 + (-0.25) = -1.25 - 0.25 = -1.50 \]

5. **Calculate the third term \( a_3 \)**:
- For \( n = 3 \):
\[ a_3 = a + (3 - 1) \cdot d = -1.25 + 2 \cdot (-0.25) = -1.25 - 0.50 = -1.75 \]

6. **Calculate the fourth term \( a_4 \)**:
- For \( n = 4 \):
\[ a_4 = a + (4 - 1) \cdot d = -1.25 + 3 \cdot (-0.25) = -1.25 - 0.75 = -2.00 \]

7. **List the first four terms**:
- The first four terms of the A.P. are:
\[ a_1 = -1.25, \quad a_2 = -1.50, \quad a_3 = -1.75, \quad a_4 = -2.00 \]

### Final Answer:
The first four terms of the A.P. are:
-1.25, -1.50, -1.75, -2.00