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  • math & puzzles Online Quiz - 209
  • Which number should come next in the series 1, 3, 6, 10, 15,
Multiple choice general knowledge math & puzzles

Which number should come next in the series 1, 3, 6, 10, 15,

  1. 8

  2. 11

  3. 24

  4. 21

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

The series increases by successive integers: 1(+2)=3, 3(+3)=6, 6(+4)=10, 10(+5)=15. The next increment is +6, so 15 + 6 = 21.

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