Multiple choice

Find the wrong number in the following number series. 21 32 45 60 78 96

  1. 78

  2. 32

  3. 21

  4. 60

  5. 96
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A Correct answer
Explanation

Analyze the pattern: 21, 32, 45, 60, 78, 96. The differences are: +11, +13, +15, +18, +18. The expected pattern should be consecutive odd numbers: +11, +13, +15, +17, +19. This would give: 21, 32, 45, 60, 77, 96. The number 78 breaks the pattern - it should be 77.

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