What is the next number of the following sequence
9,3 ,6,21 ,9,12,33,15,18,?

• divide the series like below
  
  {9,3,6) , (21,9,12) , (33,15,18), (x,y,z)
  9--3*3 3--1*3 6--2*3
  21-7*3 9--3*3 12-4*3
  33-11*3 15-5*3 18--6*3
  x--15*3=45 y--7*3=21 z--8*3=24
  
  So the next terms ll be 45, 21, 24
• 10 years agoHelpfull: Yes(36) No(3)
• sorry It is full solution;
  Look upon the series Carefully
  
  (9,3,6)...(21,9,12)...(33,15,18)
  
  21 - 9 = 12
  33 - 21 = 12
  x - 33 = 12
  
  x = 45
  answer will be 45
  
  9 - 3 = 6
  21 - 9 = 12
  33 - 15= 18
  
  
• 10 years agoHelpfull: Yes(9) No(4)
• there are 3 series
  1st(9 21 33 ?)9+12=21,21+12=33,33+12=45(ans)
  2nd(3 9 15 ?)3*1=3,3*3=9,3*5=15,3*7=21
  3rd(6 12 18 ?)table of 6
• 10 years agoHelpfull: Yes(2) No(0)
• answer is 45
  
• 10 years agoHelpfull: Yes(1) No(0)
• 9-3=6
  21-9=12
  33-15=18
  21-9=33-21=12
  33+12=45(ans)
  45-21=24
• 10 years agoHelpfull: Yes(0) No(2)
• Look upon the series Carefully
  
  (9,3,6)...(21,9,12)...(33,15,18)
  
  9 - 3 = 6
  21 - 9 = 12
  33 - 15= 18
  
• 10 years agoHelpfull: Yes(0) No(4)
• 9-3=6
  21-9=12
  33-15=18
  39-15=24
  a:39
• 10 years agoHelpfull: Yes(0) No(0)