Which of the following is not meaningful ?

Options

A. VX
B. XV
C. XXV
D. XXXV

Answer

To determine which of the following Roman numeral combinations is not meaningful, we will analyze each option step by step.

### Step 1: Analyze Option 1 - VX
- In Roman numerals, "V" represents 5 and "X" represents 10.
- The combination "VX" suggests that we are trying to subtract V from X, which is not a valid operation in Roman numeral notation.
- According to Roman numeral rules, a smaller numeral cannot precede a larger numeral unless it is a specific case (like IV for 4). "V" cannot be subtracted from "X".
- Therefore, "VX" is not a meaningful Roman numeral.

### Step 2: Analyze Option 2 - XV
- In this case, "X" (10) is before "V" (5).
- This means we add them together: 10 + 5 = 15.
- Thus, "XV" is a valid and meaningful Roman numeral.

### Step 3: Analyze Option 3 - XXV
- Here, we have "XX" (which is 10 + 10 = 20) followed by "V" (5).
- Adding these together gives us: 20 + 5 = 25.
- Therefore, "XXV" is also a valid and meaningful Roman numeral.

### Step 4: Analyze Option 4 - XXXV
- In this option, "XXX" (which is 10 + 10 + 10 = 30) is followed by "V" (5).
- Adding these gives us: 30 + 5 = 35.
- Thus, "XXXV" is a valid and meaningful Roman numeral.

### Conclusion
After analyzing all the options, we find that:
- Option 1: VX is not meaningful.
- Options 2, 3, and 4 (XV, XXV, XXXV) are all meaningful.

Therefore, the answer to the question is **Option 1: VX**.

---