Which of the following is the odd one out?

Question

Which of the following is the odd one out?

2, 3, 5

11, 13, 17

4, 6, 8

7, 19, 23

1. A. 2, 3, 5
2. B. 11, 13, 17
3. C. 4, 6, 8 (Correct answer)
4. D. 7, 19, 23

Correct Answer

Option C — 4, 6, 8

Detailed Solution & Explanation

The correct answer is 4, 6, 8.

Key Points

• Groups A (2,3,5), B (11,13,17) and D (7,19,23) contain only prime numbers.
• Group C (4,6,8) is entirely even composites — not one is prime — so it is the odd group.
• For group-based odd-one-out, find the shared property across the majority (all-prime here) and pick the group that fails it.