Identify the Odd One Out:

The correct answer is Option (3) → 247

Note: The answer is as per the NTA official key. However, the logic used by NTA is not explicitly clear, and multiple interpretations are possible as explained below.

Alternative valid observations:

Option 2: 137- it can be the answer because of the following:

• 175 = 5 × 5 × 7 → composite
• 137 → prime
• 247 = 13 × 19 → composite
• 213 = 3 × 71 → composite

 Only 137 is prime, others are not. So it can be considered the odd one out

Option 4 : 213 can be the odd one out because it is the only number in the list that is divisible by 3. The others are all non-multiples of 3.