The gold number range of some of the lyophilic colloids is given below:
A: 0.005 - 0.01, B: 0.15 - 0.25, C: 0.04 - 1.0, D: 15 - 25.
The following data shows the number of students in different streams in a school:
Which type of graph is best suited to represent this data?
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)