7. 5, 9, 12, 18, 26, 36, 47, 72, _ ?

• 75
  Let 1st series 5,12,26,47,_
  2nd series 9,18,36,72
  In 1st series, difference between the two consecutive numbers is multiples of 7
  12-5=7
  26-12=14
  47-26=21
  next difference will be 28,
  next num is=47+28=75
  Finaaly, it like 5,9,12,18,26,36,47,72,75.
• 12 years agoHelpfull: Yes(12) No(2)
• what about 7?
• 12 years agoHelpfull: Yes(2) No(0)