Multiple choice

Directions: Find out the wrong term in the given series. 11, 18, 27, 36, 51, 66, 83

  1. 18

  2. 27

  3. 36

  4. 51

  5. 83
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The differences are: 18-11=7, 27-18=9, 36-27=9, 51-36=15, 66-51=15, 83-66=17. The pattern of differences should be 7, 9, 11, 13, 15, 17. If the series were 11, 18, 27, 38, 51, 66, 83, the differences would be 7, 9, 11, 13, 15, 17. Thus, 36 is the wrong term.

AI explanation

The differences between the consecutive terms are 7, 9, 9, 15, 15, and 17. The intended pattern adds consecutive odd numbers starting from 7, so the differences should be 7, 9, 11, 13, 15, and 17. Therefore, the term after 27 should be 27 + 11 = 38, which makes 36 the wrong term.

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