Multiple choice

Find the wrong number in the following series. 1, 2, 5, 11, 24, 36

  1. 36

  2. 12

  3. 5

  4. 24
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is: 1×2+0=2, 2×2+1=5, 5×2+1=11, 11×2+2=24, 24×2+1=49... but 36 doesn't fit. Alternatively, differences are +1, +3, +6, +13 (should be +12), making 24 the wrong term. Corrected series: 1, 2, 5, 11, 23, 47.

Keep practicing — related questions