90, 180, 12, 50, 100, 200, ?, 3, 50, 4, 25, 2, 6, 30, 3

• 30*3=90
  6*30=180
  6*2=12
  25*2=50
  4*25=100
  50*4=200
  3*50=150 ans is 150
• 12 years agoHelpfull: Yes(5) No(3)
• 90, 180, 12, 50, 100, 200, ?, 3, 50, 4, 25, 2, 6, 30, 3
  sol:-
  last two num -----------------(30*3) = 90------- (first num)
  previous last two num -----(6*30) = 180---- (sec num)
  another last two num-------(6*2) = 12 -------(3rd num)
  another last two num -------(25*2) =50---------(4th num)
  another last two num -------(4*25) =100---------(5th num)
  another last two num -------(50*4) =200---------(6th num)
  then, -----------------------------(3*50) =150---------(7th missing term)
• 8 years agoHelpfull: Yes(5) No(0)
• Clearly, 90 = 30 ×3, 180 = 6 × 30, 12 = 2 ×6, 50 = 25 ×2,
  100 = 4 × 25, 200 = 50 × 4.
  So, missing term = 3 × 50 = 150.
• 12 years agoHelpfull: Yes(1) No(2)