1, 3, 5, 1, 9, -3, 13, -11, 17, .......?

• Ans: -27 It is an Alternative series.
  1+4=5
  5+4=9
  9+4=13
  13+4=17
  
  3-2 =1
  1-4 =-3
  -3-8=-11
  -11-16=-27
• 12 years agoHelpfull: Yes(26) No(0)
• here there r 2 series first 1,5,,9,13,17.....
  nd second 3,1,-3,-11.....?
  3-2=1
  1-4=-3
  -3-8=-11
  now -11-16=-27
  so answr=-27
• 12 years agoHelpfull: Yes(6) No(0)
• -27
  1+4=5
  5+4=9
  9+4=13
  13+4=17
  
  3-2=1
  1-4=-3
  -3-8=-11
  -11-16=-27
• 12 years agoHelpfull: Yes(4) No(0)
• SOLUTION IS -27.
  consider alternate numbers in the above given sequence,the subtract the consecutive numbers from the selected alternative numbers..
  so,
  3-1=2
  1-(-3)=4
  -3-(-11)=8
  we can suspect the diff would be 16,,
  let the number to be find is x..
  then,
  -11-x=16
  x=-27.
  
• 12 years agoHelpfull: Yes(3) No(0)
• -27.
  there are two series
  first-->
  1+4=5,
  5+4=9,
  9+4=13,
  13+4=17 and
  second-->
  3-2=1,
  1-4=-4,
  -3-8=-11,
  -11-16=-27 thats it.
• 12 years agoHelpfull: Yes(2) No(0)
• -37 ...in this question 2 sereis 1at is 1,5,9,13,17,it add 4 to last and find next and other series is 3,1,-3,-11......in this series subtrat -2then -4then -8 then subtract -16....so-11+(-16)=-37............its my answer
• 12 years agoHelpfull: Yes(1) No(4)
• DIFFERENCE BETWEEN 1,5,9,13,17 IS 4 S0 NEXT NUMBER 21
  DIFFERENCE BETWEEN 3,1,-3,-11 IS 2^n SO NEXT NUMBER -27
• 12 years agoHelpfull: Yes(1) No(0)