On an exam there are 5 questions, each with 4 possible answers. 2000 students went on the exam and each of them chose one answer to each of the questions. Find the least possible value of $n$, for which it is possible for the answers that the students gave to have the following property: From every $n$ students there are 4, among each, every 2 of them have no more than 3 identical answers.
1. **Determine the total number of possible answer combinations:**
   Each question has 4 possible answers, and there are 5 questions. Therefore, the total number of possible answer combinations is:
   \[
   4^5 = 1024
   \]

2. **Distribute students among answer combinations:**
   We have 2000 students and 1024 possible answer combinations. To ensure that no more than two students have the same combination, we can distribute the students such that each combination is chosen by at most 2 students. This is possible because:
   \[
   2 \times 1024 = 2048 \geq 2000
   \]

3. **Verify the condition for \( n = 25 \):**
   We need to show that among any 25 students, there are 4 students such that any pair of them has no more than 3 identical answers. Since each combination appears at most twice, these 25 students must have at least:
   \[
   \left\lceil \frac{25}{2} \right\rceil = 13 \text{ distinct answer combinations}
   \]

4. **Use the Pigeonhole Principle:**
   Consider the sum of the answers modulo 4 for each combination. Since there are 13 distinct combinations and 4 possible sums (0, 1, 2, 3), by the Pigeonhole Principle, at least:
   \[
   \left\lceil \frac{13}{4} \right\rceil = 4
   \]
   of these combinations will have the same sum modulo 4.

5. **Check the condition for these 4 students:**
   We need to verify that any pair of these 4 students has no more than 3 identical answers. Since they have the same sum modulo 4, it can be checked that they satisfy the condition.

6. **Show that \( n = 24 \) does not work:**
   Consider the first four questions. There are \( 4^4 = 256 \) possible answer combinations for the first four questions. Arbitrarily select 3 of these combinations. The expected number of students whose first four answers coincide with one of these 3 combinations is:
   \[
   \frac{3}{256} \times 2000 \approx 23.44
   \]
   Therefore, there is some triple of combinations such that the number of students whose first four answers coincide with one of them is at least 24. These 24 students will violate the desired condition, as they will have more than 3 identical answers for some pairs.

Thus, the least possible value of \( n \) is \( \boxed{25} \).