3, 22, 7, 45, 15,? , 31
a)91 b)151 c)90 d)67

• there are two series...3*2+1,,7*2+1....
  22*2+1,,so 45*2+1=91...
  ans 91
• 12 years agoHelpfull: Yes(4) No(0)
• answer is 91
  two series
  3,7,15,31 = difference is 4 ,8 ,16 which is multiple of 2 from the previous
  22,45,?= 23 , 46
  hence 45 + 46=91
• 12 years agoHelpfull: Yes(2) No(0)
• 91
  
  22*2+1=45
  45*2+1=91
• 12 years agoHelpfull: Yes(0) No(2)
• 91IS ANS
  3*2+1=7 IN THIS SEREIS
  45*2+1
• 12 years agoHelpfull: Yes(0) No(0)
• Ans: (a)91 why because the difference between numbers are +19;-15;+38;-30;+76;-60...
• 12 years agoHelpfull: Yes(0) No(0)
• first term 3 ,3*2=6 and +1 =7 ,so third term become 7
  second term 22,22*2 =44 and +1 =45 so fourth term become 45
  sim 15,
  and 45*2=90 and +1 = 91 is the answer
• 9 years agoHelpfull: Yes(0) No(0)
• 91 bcpz 45*2+1
• 6 years agoHelpfull: Yes(0) No(0)