Multiple choice

In the following number series, a term is wrong. Find the wrong term. $41 \quad 21 \quad 21 \quad 34.5 \quad 71 \quad 180$

  1. 71

  2. 41

  3. 34.5

  4. 21

  5. 180

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The series follows the pattern: multiply by an increasing factor (0.5, 1, 1.5, 2, 2.5) and add 0.5. Starting from 41: 41 × 0.5 + 0.5 = 21, 21 × 1 + 0.5 = 21.5 (not 21), 21.5 × 1.5 + 0.5 = 32.75... The second 21 breaks this pattern. If we follow the pattern correctly: 41 → 21 → 31.5 → 47.5 → 71 → 106, so 21 is incorrect.