Look at this series: 72, 76, 73, 77, 74, __, 75, ... What number should fill the blank?

A. 70 B. 71
C. 75 D. 78

• D.78
  
  There will be 2 series
  
  1st: 72 73 74 75 76 (Increasing by 1)
  2nd: 76 77 78 79 (Increasing by 1)
  
  Final: 72 76 73 77 74 78 75
• 12 years agoHelpfull: Yes(0) No(0)
• Answer:D
  
  Explanation:
  
  This series alternates the addition of 4 with the subtraction of 3.
• 12 years agoHelpfull: Yes(0) No(0)
• answer is D. 78 as series is increasing by 4 and decreasing by 3 respectively.
• 6 years agoHelpfull: Yes(0) No(0)