Multiple choice

Directions: Find the wrong number in the following series. 90 80 73 66 60 55 51

  1. 80

  2. 73

  3. 66

  4. 60
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The differences are: 90-80=10, 80-73=7, 73-66=7, 66-60=6, 60-55=5, 55-51=4. The pattern of differences should be consistent. If 80 were 83, the differences would be 7, 7, 7, 6, 5, 4, which is more logical.

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