Padma has some labels with numbers written on them. She arranged them in ascending order.

The numbers are, $34789, 8463, 124552, 34879, 8436, 124525, 8643$.

Which number come in the middle?

Nidhi formed a five-digit number, $\left[\mathrm{A}\right]\left[\mathrm{B}\right]\left[\mathrm{C}\right]\left[\mathrm{D}\right]\left[\mathrm{E}\right]$, where each alphabet represents a distinct digit from $0$ to $9$. The digits she had assigned to $\mathrm{C}$ and $\mathrm{E}$  were $7$ and $2$ respectively. 

She swapped the digits $\mathrm{C}$ and $\mathrm{E}$ and got a new number.  Then she subtracted the new number from the old number.

Which of the following is the answer will she get?

Two friends were playing a game in which they set to form a four-digit number using flashcards. They had five flashcards with one digit from the set of $0, 7, 3, 2, 5$ written on them.  They fixed $7$ at the hundredth place and formed different numbers.

What is the smallest number they could have formed? 

Ramesh bought a piece of land for $₹12,17,423$. He bought another piece of land which was $₹2,38,547$less than the price of the land he purchased first.

How much money did he pay altogether for both the lands?