Multiple choice

Find the wrong number from the given series. 20, 29, 40, 52, 68, 85

  1. 40

  2. 85

  3. 29

  4. 52
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is: 20 (+9) = 29, 29 (+11) = 40, 40 (+13) = 53, 53 (+15) = 68, 68 (+17) = 85. The differences increase by 2 each time (9, 11, 13, 15, 17). The number 52 breaks this pattern - it should be 53. Option D correctly identifies 52 as the wrong number.

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