2, 4, 9, 11, 16, __
a. 18
b. 19
c. 21
d. 23

• 18
  considerind two groups(2,9,16)(4,11,?)
  2+7=9,9+7=16
  4+7=11,11+7=18
• 10 years agoHelpfull: Yes(0) No(0)
• 2+7=9,9+7=16
  4+7=11,11+7=18
• 9 years agoHelpfull: Yes(0) No(0)
• 2+2=4
  4+5=9
  9+2=11
  11+5=16
  16+2=18
• 8 years agoHelpfull: Yes(0) No(0)
• 4-2=2
  9-4=5
  11-9=2
  16-11=5
  next the differnce will be 2 so the ans is =18
• 6 years agoHelpfull: Yes(0) No(0)
• 4-2=2,9-4=5,11-9=2,16-11=5, and then series occur firstly 2 and next 5 repeat again and again then 18-11=2
  then answer is 18
• 4 years agoHelpfull: Yes(0) No(0)