18 24 5 21 27 8 17 23 4 24 30

• 24-18=6 27-21=6 23-17=6 30-24=6
  
  24-5=19 27-8=19 23-4=19 30-19=11
  
  so ans is 11
• 11 years agoHelpfull: Yes(34) No(0)
• 5+3=8
  8-4=4
  4+7=11..ans
  consider
  (18,21,17,24),(24,27,23,30),(5,8,4,x)..
• 11 years agoHelpfull: Yes(8) No(0)
• Answer is : 11
  Solution:
  18-24=-6*
  24-5=19**
  5-21=-16
  21-27=-6*
  27-8=19**
  8-17=9
  17-23=-6*
  23-4=19**
  4-24=-20
  24-30=-6*
  
  as after every -6(*) diff, the next diff will be 19(**)
  so 30-19=11
  Final answer is 11.
• 11 years agoHelpfull: Yes(3) No(4)
• 18-----8
  17----7
  ans=7
  
• 11 years agoHelpfull: Yes(1) No(15)
• ans is 7
  18-24=6-1=5
  27-21=6+2=8
  23-17=6-2=4
  30-24=6+1=7
• 10 years agoHelpfull: Yes(0) No(1)