3, 4, 7, 7, 13, 13, 21, 22, 31, 34, ?

A. 42 B. 43
C. 51 D. 52

• B.43
  
  It have 2 sequences :
  1st seq = 3, 7, 13, 21, 31, ?
  2nd seq = 4, 7, 13, 22, 34
  Pattern in 1st seq is = + 4, + 6, + 8, + 10,..
  Pattern in 2nd seq is = 3, + 6, + 9, + 12,..
  
  So, missing term = 31 + 12 = 43
• 12 years agoHelpfull: Yes(6) No(3)