Find the next term of the pattern 1, 3, 6, 10, 15, ldots

  1. 20
  2. 18
  3. 21
  4. 25
Answer

C) 21

Triangular numbers: add 2, 3, 4, 5, then 6: 15 + 6 = 21. SLO M-09-A-10 · Understanding

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