Multiple choice

In the following number series one numbers is wrong. Find the wrong number ? 4, 6, 12, 23, 36, 54, 108

  1. 4

  2. 12

  3. 23

  4. 36

  5. 108
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C Correct answer
Explanation

Pattern: differences are +2, +6, +11, +13, +18, +54. Expected: +2, +6, +10, +14, +18, +22. Following this: 4+2=6, 6+6=12, 12+10=22, but we have 23. 22+14=36 ✓, 36+18=54 ✓, 54+22=76, but we have 108. The pattern breaks at 23. Alternatively: ×1.5 then +3 repeatedly. 4×1.5+3=9, not 6. 23 breaks the progression.

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