What is the next number of the following sequence.
9, 7, 7, 9, 13, ...

• 3^2=9 =9+0=9 (sum of digits)
  4^2=16 =1+6=7 ( " " " )
  5^2=25=2+5=7 (" " " )
  6^2=36=3+6=9 (" " " )
  7^2=49=4+9=13 (" " " )
  therefore,
  8^2=64=6+4=10 ANS
• 10 years agoHelpfull: Yes(85) No(2)
• sorry guys...here is the solution
  9-2=7
  7+0=7
  7+2=9
  9+4=13
  13+6= 19....19 is the answer
• 10 years agoHelpfull: Yes(58) No(10)
• Each succeeding number is obtained by adding the previous number to the multiple of 2 starting from -2.
  7=9+(-2)
  7=7+0
  9=7+2
  13=9+4
  So 13+6=19
• 10 years agoHelpfull: Yes(19) No(11)
• 9-2=7
  7+0=7
  7+2=9
  9+4=13...so 13 is the answer
• 10 years agoHelpfull: Yes(6) No(7)
• any one getting call for ibm referal drive
• 10 years agoHelpfull: Yes(6) No(3)
• Here,
  9-2=7
  7+0=7
  7+2=9
  9+4=13
  13+6=19
  each number is incremented by +2.
• 10 years agoHelpfull: Yes(6) No(2)
• 11
  9-2=7
  13-2=11
• 10 years agoHelpfull: Yes(2) No(0)
• (9,7) (7,9) (13,x)
  (9,7) here operation is -2
  (7,9) ,, +2
  (13,11) ,, -2
  so ans. is 11.
• 10 years agoHelpfull: Yes(1) No(1)
• 11 is the answer
  13-2=11
• 10 years agoHelpfull: Yes(1) No(1)
• 9-2=7
  7+0=7
  7+2=9
  9+4=13
  13+6=19
  
• 10 years agoHelpfull: Yes(1) No(0)
• 9, 7, 7, 9, 13, (19)
  -2 0 2 4 6
  hence 19 is the correct answer
• 10 years agoHelpfull: Yes(1) No(0)
• v=3.14*60(900+600+400)/3=119.38 so approximately 120
• 9 years agoHelpfull: Yes(1) No(2)
• 11 is the ans
• 9 years agoHelpfull: Yes(1) No(0)
• 18
  9+5-7=7,7+5-3=7,9+5-1=13,13+5-(-1)=19
• 10 years agoHelpfull: Yes(0) No(0)
• 9 7 7 9
  13 11 11 13
• 10 years agoHelpfull: Yes(0) No(0)
• 9 7 7 9 13
  1st step 9 7 13...
  2nd step 7 9 ?..
  ans 19
• 10 years agoHelpfull: Yes(0) No(0)
• 54) ans is 54
  1^2+2=3
  3^2+3=12
  5^2+4=29
  7^2+5=54
• 9 years agoHelpfull: Yes(0) No(2)