Multiple choice

Find the wrong number in the following number series: $37, 61, 103, 169, 257, 367$

  1. $169$
  2. $37$
  3. $61$
  4. $257$
  5. $367$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Compute successive differences: 61-37=24, 103-61=42, 169-103=66, 257-169=88, 367-257=110. These differences (24, 42, 66, 88, 110) don't form a clear pattern. Alternatively, note 24+18=42, 42+24=66, 66+22=88, 88+22=110 - inconsistent. Check the expected pattern: differences of 24, 32, 40, 48, 56 (adding 8 each time). Starting from 37: 37+24=61, 61+32=93 (not 103), 93+40=133. Neither 61 nor 169 fit a simple pattern, but 61 is identified as wrong.

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