hard Set 67 Logic Puzzle

Hard Sequence Pattern #67

Title
Hard Sequence Pattern #67
SequenceType
seq-mixed
DisplaySequence
  • 7
  • _
  • 9
  • 21
  • _
  • 23
  • 13
  • _
  • 15
  • 27
FullSequence
  • 7
  • 19
  • 9
  • 21
  • 11
  • 23
  • 13
  • 25
  • 15
  • 27
BlankPositions
  • 1
  • 4
  • 7
Answers
  • 19
  • 11
  • 25
Rule
Two interleaved arithmetic sequences
Question
Find the 3 missing terms in the sequence: 7, _, 9, 21, _, 23, 13, _, 15, 27
SequenceLength
10
Hint
Look at every other term separately.