easy Set 49 Logic Puzzle

Easy Sequence Pattern #49

Title
Easy Sequence Pattern #49
SequenceType
seq-mixed
DisplaySequence
  • 9
  • 13
  • 13
  • 15
  • 17
  • 17
  • 21
  • _
FullSequence
  • 9
  • 13
  • 13
  • 15
  • 17
  • 17
  • 21
  • 19
BlankPositions
  • 7
Answers
  • 19
Rule
Two interleaved arithmetic sequences
Question
Find the missing term in the sequence: 9, 13, 13, 15, 17, 17, 21, _
SequenceLength
8
Hint
Look at every other term separately.