1. 3, 22, 7, 45, 15, ?, 31 a) 91 b) 151 c) 90 d) 5

• a)91
  Let the sequence will have two series.
  1st series = 3,7,15,31
  2nd series = 22,45,??
  In this, 1st series increased like (4*1),(4*2),(4*3),(4*4).... .ie.,
  3+ 4 = 7
  7+ 8 = 15
  15+16 = 31
  2nd series increased like (23*1),(23*2),(23*3).....i.e.,
  22+ 23 = 45
  45+ 46 = 91
  Finally, sequence like
  3, 22, 7, 45, 15, 91, 31
• 12 years agoHelpfull: Yes(3) No(0)
• Ans: 91
  
  the sequence have 2 series
  
  3 7 15 31
  3*2+1=7
  7*2+1=15
  15*2+1=31
  
  similarly
  22 45 ?
  
  22*2+1=45
  45*2+1=91
  
  finally the sequence is
  
  3,22,7,45,15,91,31
  
• 12 years agoHelpfull: Yes(2) No(0)