5,9,12,18,26,36,47,72, x, value of x ??

• there are two series
  5,12,26,47,x
  and 9,18,36,72
  first series takes the form +7,+14,+21,+28
  therefore x = 47+28= 75
• 12 years agoHelpfull: Yes(23) No(0)
• alternative num's are 9,18,36,72 as follows
  9*2=18
  18*2=36
  36*2=72
  remaing alternative num's are 5,12,26,47,x as follows
  5+7=12
  12+14=26
  26+21=47
  47+28= required value( x )==75
• 12 years agoHelpfull: Yes(6) No(1)
• 75
  2 alternative series are given
  5,5+7=12,12+14=26,26+21=47,47+28=75
• 12 years agoHelpfull: Yes(3) No(0)
• 5, 9, 12, 18, 26, 36, 47, 72, _?
  it is 5 ...... 12....... 26......... 47
  12= 5+7
  26= 12+2×7
  47=26+3×7
  Next is 47+4×7=75
  and 9, 18, 36, 72 hence next 144
  Therefore 5, 9, 12, 18, 26, 36, 47, 72, 75, 144
• 12 years agoHelpfull: Yes(2) No(0)
• Take alternate numbers
  5,12,26,47,x
  5+7 =12
  12+14=26
  26+21=47
  47+28= 75
  X =75
• 12 years agoHelpfull: Yes(2) No(0)
• 2 series 9 18 36 72 and 5 12 26 47 are there .ans is 75
• 12 years agoHelpfull: Yes(1) No(0)
• diff bw 1st and 3rd terms=7
  diff bw 3rd and 5th terms=14
  diff bw 5rd and 7th terms=21
  diff bw 7th and 9th terms=28
  ans: 47+28=75
• 12 years agoHelpfull: Yes(1) No(0)