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Multiple choice

Which one number is wrong in the given series. 77, 94, 81, 92, 86, 90, 87, 88

  1. 81

  2. 92

  3. 90

  4. 86

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The series alternates +17 and -13: 77(+17)94(-13)81(+17)98(-13)85... But 86 appears instead of 85, breaking the pattern. 86 is the wrong number.

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