Multiple choice

In the following number series one number is wrong. Find the wrong number. 6 22 39 54 70 86 102

  1. 102

  2. 22

  3. 39

  4. 86

  5. 70
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C Correct answer
Explanation

Pattern: Differences between consecutive terms: 22-6=16, 39-22=17, 54-39=15, 70-54=16, 86-70=16, 102-86=16. The differences are: 16, 17, 15, 16, 16, 16. The difference 17 (between 22 and 39) breaks the pattern of differences hovering around 16. If the pattern was consistent +16, then: 6+16=22, 22+16=38 (not 39), 38+16=54, 54+16=70, 70+16=86, 86+16=102. So 39 should be 38.

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