2, 4, 3, 6, ?, ?, 9, 18, ?, ?, 33.

• 2, 4, 3, 6, ?, ?, 9, 18, ?, ?, 33.
  
  2, 4, 3, 6, 5 (6-1), 10(5*2), 9, 18, 17(18-1), 34(17*2), 33.
• 12 years agoHelpfull: Yes(5) No(0)
• 2, 4, 3, 6, ?, ?, 9, 18, ?, ?, 33.
  
  ans: 2, 4, 3, 6, 4, 8, 9, 18, 16, 32, 33.
• 12 years agoHelpfull: Yes(0) No(3)
• 5, 10, 17, 34.
  There are two alternate series. First one is 2,3,5,9,17 - next no. is arrived by doubling the previous no. and then subtracting 1.
  Second one is 4,6,10,18,34 - in this series, instead of subtracting 1, 2 is subtracted from twice the previous no.
• 12 years agoHelpfull: Yes(0) No(0)
• 2,4,3,6,5,10,9,18,17,34,33.
• 12 years agoHelpfull: Yes(0) No(1)