In each of the following questions, five (or four) numbers are given. Out of these four (or three) are alike in some way but rest one is different. Choose the one which is different from the other.

Options

A. 275
B. 451
C. 297
D. 254

Answer

To solve the problem of identifying the number that is different from the others, we will analyze the given numbers step by step.

### Step 1: Identify the Numbers
We are given four numbers: 2, 7, 5, and we need to find the one that is different from the others.

### Step 2: Analyze the Relationships
We will check if there is a consistent mathematical relationship among the numbers.

- Let's take the first number (2) and the second number (7).
- If we subtract the first number from the second number, we get:
\[ 7 - 2 = 5 \]
This matches the third number.

### Step 3: Check Other Combinations
Now, let's check the other combinations to see if they follow the same pattern:

1. **Middle Number - First Number = Third Number**:
- For the numbers 2, 7, 5:
\[ 7 - 2 = 5 \quad \text{(True)} \]

2. **Middle Number - First Number = Third Number**:
- For the numbers 2, 5, 4:
\[ 5 - 2 = 3 \quad \text{(Not equal to 4)} \]

### Step 4: Identify the Odd One Out
From our analysis, we see that the first three numbers (2, 7, 5) follow a consistent relationship, while the last set of numbers (2, 5, 4) does not maintain the same pattern. Therefore, the number that is different is:

**Option D: 4**

### Final Answer
The number that is different from the others is **4**.

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