Which group doesn’t match the pattern?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 15, 25, 40.
Logic: Second number + (Second number - First number) × 2
1. 20, 30, 50 → 30 + (30 - 20) × 2 = 30 + 10 × 2 = 50
2. 15, 25, 40 → 25 + (25 - 15) × 2 = 25 + 10 × 2 = 45 ≠ 40
3. 18, 24, 36 → 24 + (24 - 18) × 2 = 24 + 6 × 2 = 36
4. 14, 28, 56 → 28 + (28 - 14) × 2 = 28 + 14 × 2 = 56