Which one of the numbers does not belong in the following series?
2 - 3 - 6 - 7 - 8 - 14 - 15 - 30
(a)Three(b)Seven(c)eight(d)Fifteen(e)thirty

• 8 Does not belong since 1st = 2 , 2nd = 2 + 1=3;
  3rd = 2*3=6, 4th = 6 +1=7;5th should be 2*4th=2*7=14, 6th = 5th +1 = 14+1=15
  7th = 6th +1= 15+1 =16;
• 10 years agoHelpfull: Yes(3) No(0)
• ANS=(c). eight
  2+1=3;3*2=6;
  6+1=7;7*2=14;
  14+1=15;15*2=30 => 8 does not belong to this series
• 10 years agoHelpfull: Yes(2) No(0)
• Ans is 8
  because diff b/w 2 and 3 is 1
  then diff is double of 2nd digit
  then again one increase the double of 2nd digit
  2- 3- 6- 7- 14- 15- 30
  +1 *2 +1 *2 +1 *2
• 10 years agoHelpfull: Yes(0) No(0)