Look at this series: (1/9), (1/3), 1, ____ , 9, ... What number should fill the blank?

Look at this series: (1/9), (1/3), 1, ____ , 9, ... What number should

1.	Look at this series: (1/9), (1/3), 1, ____ , 9, ... What number should fill the blank?
Answer» This is a multiplication series; each number is 3 times the previous number.