Multiple choice

Find the wrong number in the given series. $121\ 145\ 169\ 196\ 225$

  1. $145$
  2. $225$
  3. $169$
  4. $196$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Check if each number is a perfect square. 121 = 11² ✓, 145 ≠ perfect square ✗, 169 = 13² ✓, 196 = 14² ✓, 225 = 15² ✓. The series should contain only perfect squares, but 145 breaks this pattern as it's not a perfect square.

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