Multiple choice

Find the wrong number series:- 75, 79, 72, 80, 69, 83, 66

  1. 69

  2. 72

  3. 79

  4. 83
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C Correct answer
Explanation

The series has two alternating patterns: odd positions (1st, 3rd, 5th, 7th) decrease by 3: 75, 72, 69, 66. Even positions (2nd, 4th, 6th) should increase by consecutive odd numbers: +1, +3, +5 → 78, 81, 86. The number 79 breaks this pattern as the second term should be 78.

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