Multiple choice

Select the term that will come next in the following series. 3, 6, 10, 15, 21, ?

  1. 28

  2. 31

  3. 49

  4. 53
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A Correct answer
Explanation

The differences between consecutive terms increase by 1 each time: 6 - 3 = 3, 10 - 6 = 4, 15 - 10 = 5, 21 - 15 = 6. Following this pattern, the next difference should be 7, so 21 + 7 = 28. This is a classic increasing-difference number series.

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