| List-I: Pollution Types | List-II: Sources of Pollution |
|---|---|
| (A) Air Pollution | (III) Combustion of coal |
| (B) Water Pollution | (IV) Effluents from industries |
| (C) Land Pollution | (I) Use of pesticides |
| (D) Noise Pollution | (II) Advertising media |
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)