Multiple choice

In the following number-series one number is wrong. Find out that wrong number? 5 12 60 342 1684 6724

  1. 342

  2. 12

  3. 60

  4. 1684

  5. None of these
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A Correct answer
Explanation

The pattern is: multiply by consecutive odd numbers (1, 3, 5, 7, 9) and add consecutive squares (1², 2², 3², 4², 5²). Starting from 5: 5×1+1=6, 6×3+4=22, 22×5+9=119, 119×7+16=849, 849×9+25=7666. The number 342 breaks this pattern. Alternatively: 5×1+7=12, 12×2+36=60, 60×3+162=342... but the expected 4th term using the pattern ×4+336 would be 576, not 1684, making 342 or 1684 potential errors.

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