List-I(State) | List-II(National Park) |
| (A) Madhya Pradesh | (I) Namdapha National Park |
| (B) Arunachal Pradesh | (II) Guindy National Park |
| (C) Meghalaya | (III) Nokrek National Park |
| (D) Tamil Nadu | (IV) Kuno National Park |
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)