1,3,7,11,15,18,21

• 24,29
  Alternate series 3(+8)11(+7)18(+6)24 and 1(+6)7(+8)15(+6)21(+8)29
  
• 10 years agoHelpfull: Yes(1) No(1)
• answer will be 24
• 10 years agoHelpfull: Yes(0) No(2)
• 1
  1+2=3
  3+4=7
  7+4=11
  11+4=15
• 10 years agoHelpfull: Yes(0) No(1)
• diff 1,3=2
  diff 3,7=4
  diff 7,11=4
  diff 11,15=4
  diff 15,18=3 here it should change i.e 4.So 18 is changed to 19 ODD ONE IS 18
  diff 18,21=3
• 10 years agoHelpfull: Yes(0) No(0)
• 18....is the odd one..
• 10 years agoHelpfull: Yes(0) No(0)