. 3, 22, 7, 45, 15,? , 31

• (3*2)+1=7
  (7*2)+1=15
  (15*2)+1=31
  (22*2)+1=45
  (45*2)+1=91...
  
  ans is 91
• 12 years agoHelpfull: Yes(7) No(0)
• 22-3=19
  45-7=38(which is double of 19)
  15+76(which is double of 38)=91ans
• 12 years agoHelpfull: Yes(1) No(0)
• break series in to two parts as-----3,7,15,31
  difference b/w two consecutive number from them as- 7-3=4,15-7=8,31-15=16
  now it is new series 4,4*2=8,8*2=16,16*2=32, will be added to next similarly
  for 22,45,?---->45-22=23 and 23*2=46 will added to next one that is 45 so it will become 45+46=91
• 12 years agoHelpfull: Yes(1) No(0)
• answer is 91...
• 12 years agoHelpfull: Yes(0) No(0)
• 91 is d ans
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• 91...bcoz..n*2+1
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