3, 1, 13, 11, 31, 29, _ Next number in series?

• 1^2+2=3
  2^2-3=1
  3^2+4=13
  4^2-5=11
  5^2+6=31
  6^2-7=29
  7^2+8=57
• 8 years agoHelpfull: Yes(43) No(0)
• ans is 57
  
  diff of 3,1 is 2
  diff of 1, 13 is 12=4*3
  diff of 13,11 is 2
  diff of 11, 31 is 20=4*5
  diff of 31, 29 is 2
  diff of 29, 57 is 28=4*7
• 8 years agoHelpfull: Yes(11) No(2)
• 1^2+2=3
  2^2-3=1
  3^2+4=13
  4^2-5=11
  5^2+6=31
  6^2-7=29
  7^2+8=57
• 7 years agoHelpfull: Yes(4) No(1)
• 57
  10 ,18 ,26 alter nate serise 1-3-5-7
• 8 years agoHelpfull: Yes(3) No(3)
• Ans is 59,57
  Solution:
  all the numbers are odd numbers
  the difference between each odd pair is 2 (i.e 3-2=1,13-11=2,29-31=2)
  The difference between odd positions of the numbers are is as follows 10(13-3=10),20(31-11=20),30(59-29=30)...
• 8 years agoHelpfull: Yes(2) No(1)
• 1^2+2=3
  2^2-3=1
  3^2+4=13
  4^2-5=11
  5^2+6=31
  6^2-7=29
  7^2+8=57
  
• 8 years agoHelpfull: Yes(1) No(1)
• group a pair of two starting number like this (3,1), (13,11),(31,29),
  (3,1) after dat add 10 *1 and den subtract it by 2 after adding it...=(13,11)
  (13,11) after dat add 10*2 and subtact it by 2 after adding it....-=(31,29)
  after dat wat wil happen
  (31,29) after dat add 10*3 and subtract it by 2 after ading it...=(61,59)
  so d number will be 61
  so everythng depnds upn d option it z also a process
• 8 years agoHelpfull: Yes(1) No(2)
• 3,1 diff is 2 and 13 ,1 is 12 net -2, and 12+8 then -2 ,and 20+8 so 29+28=57
• 8 years agoHelpfull: Yes(0) No(0)
• 3-1=2 diff =2,1+12=13,13-2=11,11+20=31,31-29=2,29+28=57...
  3, 1, 13, 11, 31, 29, 57,59
  2 ,12, 2, 20, 2, 28, 2
  ans =57.
• 8 years agoHelpfull: Yes(0) No(0)
• -5 + 8 = 3 --------- initial step
  3 - 2 = 1
  1 + 12 = 13 ----------(8 - 2) * 2 = 12
  13 - 2 = 11
  11 + 20 = 31 --------(12 - 2) * 2 = 20
  31 - 2 = 29
  29 + 36 = 65 --------(20 - 2) * 2 = 18
  65 - 2 = 63
  63 + 68 = 131 ------(36 - 2) * 2 = 68
• 8 years agoHelpfull: Yes(0) No(1)
• difference between 13 and 3 is 10
  same way difference between 31 and 13 is 18
  it means we should add +8 for next no
  31+18+8=57
  
• 8 years agoHelpfull: Yes(0) No(0)
• 57.......3-1=2
  13-1=12 multiple of 4
  13-11=2
  31-11=20 multiple of 4...like data at last 57-29=28 multiple of 4 .
  multiple of 4 for odd numbers
  
  
• 8 years agoHelpfull: Yes(0) No(0)
• take first four numbers 3 1 13 11 (-2 +12 -2)
  3-2=1
  1+12=13
  13-2=11
  continue this for the second series also
  31-2=29
  29+12=41
  so ans=41
• 7 years agoHelpfull: Yes(0) No(0)
• 39
  difference checking between numbers
• 5 years agoHelpfull: Yes(0) No(0)
• gccbvmnbbbhhhhjjj
• 2 years agoHelpfull: Yes(0) No(0)