Multiple choice

Find out the wrong number in the given series. $72 \quad 73 \quad 74 \quad 80 \quad 92 \quad 112$

  1. 72

  2. 73

  3. 80

  4. 92

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct series should be 72, 74, 80, 92, 112 where the differences between consecutive terms are 2, 6, 12, 20. These differences follow the pattern n(n+1): 1×2=2, 2×3=6, 3×4=12, 4×5=20. The number 73 breaks this elegant pattern, making it the wrong number. If 73 is removed, the series follows a consistent mathematical rule.

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