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

• 3,7,15,31
  22,45,?
  3*2+1=7,7*2+1=15,15*2+1=31
  22*2+1=45,45*2+1=91
• 12 years agoHelpfull: Yes(4) No(0)
• 1st series
  3+3+1
  7+7+1
  15+15+1=31
  2nd series
  22+22+1
  45+45+1=91
• 12 years agoHelpfull: Yes(2) No(0)
• answer 91
  see 2(3)+1=7,
  2(22)+1=45
  2(15)+1=31
  so
  2(45)+1=91
• 12 years agoHelpfull: Yes(1) No(0)
• there are two series 3,7,15,31 and 22,45,?
  first series has 4,8,16 difference between no
  so between 22 and 45 difference is 23
  now 23*2=46
  45+46=91.
• 12 years agoHelpfull: Yes(1) No(0)
• 3,22 differce 19, 7,45 differce is 38
  19,19*2=38,19*4=76
  so ans is 15+76=91
• 12 years agoHelpfull: Yes(0) No(0)
• since there are two series,
  3*2+1=7,7*2+1=15
  similarly
  22*2+1=45,45*2+1=91
• 12 years agoHelpfull: Yes(0) No(0)
• 45*2 +1=91
• 12 years agoHelpfull: Yes(0) No(0)
• answer 91
  
• 12 years agoHelpfull: Yes(0) No(0)
• this consist of 2 series of the form 3*2+1=7
  22*2+1=45
  7*2+1=15
  45*2+1=91 it s the answer
• 12 years agoHelpfull: Yes(0) No(0)
• 91 is the answer
• 12 years agoHelpfull: Yes(0) No(1)
• two series
  a)3,7,15,31
  3+(4)=7.........4
  7+(8)=15......4+(4)=8
  15+(16)=31.....8+(8)=16
  b)22,45,?
  22+(23)=45
  45+(46)=91.....23+23=46
  ans=91
• 12 years agoHelpfull: Yes(0) No(0)