22,99,34,21,101,31,18,104,15

• ans:(22,99,34),(21,101,31),(18,104,15)(?. .)
  22-1=1;21-3=18;18-5=13
  ans 13
  
• 11 years agoHelpfull: Yes(29) No(10)
• 22,99,34,21,101,31,18,104,15,?
  99-101=2,101-104=3
  34-21=13,31-18=13,15-x=13
  so ans is 2
• 10 years agoHelpfull: Yes(15) No(10)
• 13
  there are three series
  22 21 18 ...
  99 101 104...
  34 31 15....
  
  Next number is in first series so its 13 (18-5)
• 8 years agoHelpfull: Yes(0) No(2)