9,12,4,8,12,15,5,9,3,6,2,6,6,9

• take 9,12,4,8 as a pair
  dan 9+3=12 ,4*3=12 ,4+4=8
  take 12,15,5,9 as a pair
  similarly 3,6,2,6,
  dan 6,9,3,7
  
  so answer is 3
  
• 12 years agoHelpfull: Yes(25) No(3)
• take 9,12,4........12,15,5......3,6,2......6,9,?......
  12-9=3*4=12(middle term)
  15-12=3*5=15
  6-3=2*3=6
  9-6=3*3=9
  
  and thus the ans is 3....
• 12 years agoHelpfull: Yes(12) No(2)
• Ans 3
  same as Below
  
• 12 years agoHelpfull: Yes(3) No(3)