Multiple choice

Find the wrong number in the following number series. 12, 12, 30, 120, 654, 4620

  1. 12

  2. 654

  3. 30

  4. 120

  5. 4620
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Analyze the pattern in 12, 12, 30, 120, 654, 4620. Check ratios: 12/12=1, 30/12=2.5, 120/30=4, 654/120=5.45, 4620/654≈7.06. The multipliers should follow a pattern. If the pattern were ×1, ×2.5, ×4, ×5.5, ×7, then: 12×1=12, 12×2.5=30, 30×4=120, 120×5.5=660 (not 654), 660×7=4620. So 654 is the wrong number; it should be 660.

Keep practicing — related questions