Which one of the following is not correct?

Options

A. `1 p = ₹ 0.01`
B. one and a half dozen = 18
C. 1 mm = 0.1 cm
D. 3 L 30 mL = 330 mL

Answer

To solve the question "Which one of the following is not correct?", we will analyze each option one by one.

### Step-by-Step Solution:

1. **Option A: One paisa is equal to 0.01 rupees.**
- We know that 1 rupee is equal to 100 paisa.
- Therefore, 1 paisa = 1/100 rupees = 0.01 rupees.
- **Conclusion**: Option A is correct.

2. **Option B: One and half dozen is equal to 18.**
- We know that 1 dozen is equal to 12.
- Half dozen = 12/2 = 6.
- Therefore, one and half dozen = 12 + 6 = 18.
- **Conclusion**: Option B is correct.

3. **Option C: One millimeter is equal to 0.1 centimeter.**
- We know that 1 centimeter is equal to 10 millimeters.
- Therefore, 1 millimeter = 1/10 centimeters = 0.1 centimeters.
- **Conclusion**: Option C is correct.

4. **Option D: 3 liters 30 ml is equal to 330 ml.**
- We know that 1 liter is equal to 1000 ml.
- Therefore, 3 liters = 3 × 1000 ml = 3000 ml.
- Now, adding 30 ml gives us: 3000 ml + 30 ml = 3030 ml.
- **Conclusion**: Option D is not correct, as 3 liters 30 ml is equal to 3030 ml, not 330 ml.

### Final Answer:
The option that is not correct is **Option D**.