7,5,9,12,18,36,47,72,?

• 
  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(13) No(13)
• where is 26 in the question
• 12 years agoHelpfull: Yes(11) No(2)