9,4,16,6,36,21,44,?

• 9-4=5
  16-6=10
  36-21=15
  44-x=20
  x=24(Ans)
  
• 11 years agoHelpfull: Yes(46) No(4)
• I think last number should be 441 instead of 41 in series..
  9,4,16,6,36,21,441,?
  9-5=4
  4^2=16
  16-10=6
  6^2=36
  36-15=21
  21^2=441
  441-20=421
  
  Then ? = 441-20=421
• 11 years agoHelpfull: Yes(17) No(9)