Explanation:

Let’s break it down, step by step:

- Look at the first pair: 1246 becomes 2164. What’s happening? It’s just swapping digits: the second digit moves to the first spot, then the first digit goes second, the third and fourth swap places too. In simple terms, positions: 1 2 3 4 becomes 2 1 4 3.

- Next, 3482 to 4328. Try the same trick: 3 (first) and 4 (second) swap, 8 (third) and 2 (fourth) swap. So, again: 3482 ? 4328 (2 1 4 3 order).

- Now, apply that logic to the missing number. You want ? : 2548.

- Let’s reverse the rule: Which number, if you swap the first with the second, and third with fourth, gives 2548?

- Undoes the order: 2 1 4 3 (so, 25 48 ? 2nd 1st 4th 3rd becomes original: 2 5 4 8, which when swapped following the same rule gives 5 2 8 4.)

- So, original must be 5284.

Let’s check the options:

1. 2485 – no

2. 5284 - absolutely matches

3. 2854 – doesn’t work

4. 2458 – doesn’t fit

Correct Answer: Option 2: 5284