11,15,23,,29,71,?

• one solution may be like :
  11 * 2 + 1 = 23
  15 * 2 - 1 = 29
  23 * 3 + 2 = 71
  29 * 3 -2 = 85 (ans)
• 7 years agoHelpfull: Yes(48) No(4)
• 15-11=4
  23-15=8
  so now we know that the diff is doubled in the next case
  therefore, next series would go like,
  71-29=42
  no by doubling 42 we'll get 84
  so ans is 71+84=155
• 7 years agoHelpfull: Yes(6) No(21)
• 11,15,23,29,71
  15-11=4
  29-23=6
  x-71=8
  x=79
• 7 years agoHelpfull: Yes(5) No(20)
• 11 * 2 + 1 = 23
  15 * 2 - 1 = 29
  23 * 3 + 2 = 71
  29 * 3 -2 = 85
• 7 years agoHelpfull: Yes(4) No(0)