Find out the wrong number in the series.
3, 7, 15, 27, 63, 127, 255

A. 7 B. 15
C. 27 D. 63
E. 127

• i guess 7...only no. nt divisible by 3
• 12 years agoHelpfull: Yes(2) No(5)
• Answer: Option C
  
  Explanation:
  
  Go on multiplying the number by 2 and adding 1 to it to get the next number.
  
  So, 27 is wrong.
• 11 years agoHelpfull: Yes(2) No(0)
• 3+3=6+1=7, 7+7=14+1=15, 15+15=30+1=31, 63+63=126+1=127 and 127+127=254+1=255
  Hence option c i.e. 27 instead of 31
• 10 years agoHelpfull: Yes(1) No(1)