Multiple choice

Find out the wrong term in the following number series. 64 165 100 136 120 124

  1. 165

  2. 136

  3. 120

  4. 124

  5. 64
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A Correct answer
Explanation

The series follows the pattern: square then +1, then square then -1, alternating. 8²+1=65 (not 165), 9²-1=80, 10²+1=101, 11²-1=120, 12²+1=145. The series should be 65, 80, 101, 120, 145, 168. The term 165 breaks this alternating pattern - it should be 65 (8²+1).

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