5, 9, 12, 18, 26, 36, 47, 72, _?
a)75 b)135 c)100 d)55

• 5+(7)=12,12+(7*2)=26,26+(7*3)=47 now next will be 47+(7*4)=75
• 13 years agoHelpfull: Yes(18) No(0)
• actually it contain 2 series: 5,12,26,47,?
  here we can see that difference between two consecutive no is multiple of 7
  12-5=7
  26-12=14
  47-26=21
  next difference will be 28 so
  next number is=47+28=75
  final series will be 5,12,26,47,75
• 13 years agoHelpfull: Yes(11) No(1)
• 75...there r two series...5,12,26,47...the difference between them is 7,14,21...which are multiples of 7.so the next no. will be 75
• 13 years agoHelpfull: Yes(3) No(1)
• Even Terms: 9, 18, 36, 72
  n+1=n*2
  ODD Terms:5,12,26,47,
  5+(7)=12, here i=1
  12+(7*2)=26,here i=i+1
  26+(7*3)=47 here i=i+1
  So finaly we conclude that n+1=n+(7*(i+1)) here i=i+1=4
  so that ans is 47+(7*4)=75.
• 13 years agoHelpfull: Yes(3) No(0)
• there are two series =
  5,9,5+(7*1)=12,9*2=18,12+(7*2)=26,18*2=36,26+(7*3)=47,36*2=72,47+(7*4)=75
• 13 years agoHelpfull: Yes(3) No(1)
• 75
  There are 2 series .
  First one is 5,12,26,47
  Difference is increasing in multiple of 7.
  12-5=7
  26-12=14
  47-26=21
  x-47=28 , x=75.
• 8 years agoHelpfull: Yes(0) No(0)