hard Set 60 Logic Puzzle

Hard Sequence Pattern #60

Title
Hard Sequence Pattern #60
SequenceType
seq-mixed
DisplaySequence
  • 9
  • _
  • 12
  • 21
  • _
  • 26
  • 18
  • _
  • 21
  • 36
FullSequence
  • 9
  • 16
  • 12
  • 21
  • 15
  • 26
  • 18
  • 31
  • 21
  • 36
BlankPositions
  • 1
  • 4
  • 7
Answers
  • 16
  • 15
  • 31
Rule
Two interleaved arithmetic sequences
Question
Find the 3 missing terms in the sequence: 9, _, 12, 21, _, 26, 18, _, 21, 36
SequenceLength
10
Hint
Look at every other term separately.