hard Set 57 Logic Puzzle

Hard Sequence Pattern #57

Title
Hard Sequence Pattern #57
SequenceType
seq-visual
DisplaySequence
  • 1 dot
  • _
  • 6 dots
  • 10 dots
  • _
  • 21 dots
  • 28 dots
  • _
  • 45 dots
  • 55 dots
FullSequence
  • 1 dot
  • 3 dots
  • 6 dots
  • 10 dots
  • 15 dots
  • 21 dots
  • 28 dots
  • 36 dots
  • 45 dots
  • 55 dots
BlankPositions
  • 1
  • 4
  • 7
Answers
  • 3 dots
  • 15 dots
  • 36 dots
Rule
Triangular dot patterns
Question
Find the 3 missing terms in the sequence: 1 dot, _, 6 dots, 10 dots, _, 21 dots, 28 dots, _, 45 dots, 55 dots
SequenceLength
10
Hint
Count how many are added each time.