Multiple choice

Which term given in the series does not follow the pattern of the series? 10, 15, 25, 40, 60, 85, 120

  1. 10

  2. 120

  3. 25

  4. 85

  5. 40
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B Correct answer
Explanation

The differences between consecutive terms are 5, 10, 15, 20, 25, 35. The sequence of differences should be 5, 10, 15, 20, 25, 30. The last term 120 is incorrect because 85 + 30 = 115.

AI explanation

The differences between consecutive terms increase by 5 each time. The differences are 5, 10, 15, 20, 25 and 35; the last difference should be 30, which would make the last term 115. Because the last term is given as 120, it is the incorrect term.

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