Insert the missing number
6, 7, 9, 13, 21, ...
A. 25 B. 29
C. 37 D. 32

• Ans: C. 37
  
  Explanation:
  Difference between two numbers in the series is multiplied by 2 to get the next number
  6,7 ...Difference is 1
  7,9 Difference is 2
  9,13 difference is 4
  13,21 Difference is 8
  21, 37 Difference is 16....
• 13 years agoHelpfull: Yes(3) No(0)
• ans: C 37
  
  6, 7, 9, 13, 21, .37.
  diff: 1 2 4 8 16
  
• 12 years agoHelpfull: Yes(1) No(0)
• Here
  the series: 6,(+1) 7,(+2),9,(2+2=4) 13,(4+4=8) 21,(8+8=16)37
  so the ans is C. 37
• 12 years agoHelpfull: Yes(0) No(0)
• 6+1 => 7 ; 7+2=>9; 9+4=>13; 13+8=>21;21+16=>37;
  Ans :37
• 7 years agoHelpfull: Yes(0) No(0)