Multiple choice

One term in the following number series is incorrect. Identify the wrong term. 15, 17, 22, 32, 49, 76

  1. 49

  2. 32

  3. 22

  4. 76
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The differences are: 17-15=2, 22-17=5, 32-22=10, 49-32=17, 76-49=27. The second differences are: 3, 5, 7, 10. The last difference should be 9 (3, 5, 7, 9). If the last difference were 9, 49+9=58, not 76.

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