3,11,31,69,131,___, ___

• 223
  3= 2+1^3
  11= 3+2^3
  31= 4+3^3
  ..
  ..
  6^3+7 = 216+7=223
• 12 years agoHelpfull: Yes(5) No(3)
• 1^3+2=3
  2^3+3=11
  3^3+4=31
  4^3+5=69
  5^3+6=131
  6^3+7=223
  ............
• 7 years agoHelpfull: Yes(2) No(0)
• 3 11 31 69 131
  11-3,31-11,69-31, 131-69
  8 20, 38 62
  again 20-8,38-20,62-38
  12 , 18 ,24
  again 18-12,24-18
  6, 6
  so again form bottom to top 24+6+62=92
  add 131+92=223
  is the answer
• 12 years agoHelpfull: Yes(1) No(2)
• The next two terms of the series are 223 and 351.
  
  Explanation:
  
  The nth term of the series is = (n+1)*n^3
  So first term of the series is = (1+1)+1^3 = 3
  second term of the series is = (2+1)+2^3 = 11
  Third term of the series is = (3+1)+3^3 = 31
  Fourth term of the series is = (4+1)+4^3 = 69
  Fifth term of the series is = (5+1)+5^3 = 131
  Sixth term of the series is = (6+1)+6^3 = 223
  Seventh term of the series is = (7+1)+7^3 = 351
  and so on.
  
• 12 years agoHelpfull: Yes(0) No(1)