Explanation:

- We are given that the Lok Sabha seats for Uttar Pradesh (UP) = 18 more than twice its Rajya Sabha seats.

- Let RS be the number of Rajya Sabha seats for UP. Then, Lok Sabha seats = 2 * RS + 18.

- Substituting RS = 31 (from the table): Lok Sabha seats = 2 * 31 + 18 = 62 + 18 = 80.

- UP has a population of 25 Crores, and 1 Crore = 10 million.

- Population density per Lok Sabha seat = Total population / Lok Sabha seats = 25 Crores / 80.

- Convert population into a consistent unit: 25 Crores = 250 million.

- Density = 250 million / 80 = 3.125 million per seat.

- In numerical terms, this is 3,125,000.

Thus, the correct answer is:

- Option 2: 3,125,000