medium Set 26 Logic Puzzle

Medium Sequence Pattern #26

Title
Medium Sequence Pattern #26
SequenceType
seq-mixed
DisplaySequence
  • 1
  • 12
  • 3
  • _
  • _
  • 18
  • 7
  • 21
FullSequence
  • 1
  • 12
  • 3
  • 15
  • 5
  • 18
  • 7
  • 21
BlankPositions
  • 3
  • 4
Answers
  • 15
  • 5
Rule
Two interleaved arithmetic sequences
Question
Find the 2 missing terms in the sequence: 1, 12, 3, _, _, 18, 7, 21
SequenceLength
8
Hint
Look at every other term separately.