medium Set 68 Logic Puzzle

Medium Sequence Pattern #68

Title
Medium Sequence Pattern #68
SequenceType
seq-mixed
DisplaySequence
  • 9
  • 11
  • 12
  • _
  • _
  • 15
  • 18
  • 17
FullSequence
  • 9
  • 11
  • 12
  • 13
  • 15
  • 15
  • 18
  • 17
BlankPositions
  • 3
  • 4
Answers
  • 13
  • 15
Rule
Two interleaved arithmetic sequences
Question
Find the 2 missing terms in the sequence: 9, 11, 12, _, _, 15, 18, 17
SequenceLength
8
Hint
Look at every other term separately.