Multiple choice

Directions: A number series is given. Find the incorrect term. 5, 5, 8, 16, 31, 54, 90

  1. 8

  2. 16

  3. 31

  4. 54

  5. 90
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D Correct answer
Explanation

The differences are: 0, 3, 8, 15, 23, 36. The differences of differences are: 3, 5, 7, 8, 13. The pattern of differences should be 3, 5, 7, 9, 11. If 54 was 53, the sequence would be 5, 5, 8, 16, 31, 53, 86. The term 54 is incorrect.

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