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Multiple choice

In the given series, which number is incorrect? 15, 22, 31, 42, 49, 70

  1. 49

  2. 15

  3. 22

  4. 42

  5. 67

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The differences are: 22-15=7, 31-22=9, 42-31=11, 49-42=7, 70-49=21. The pattern of differences should be 7, 9, 11, 13, 15. 42+13=55, 55+15=70. Thus, 49 is incorrect.

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