A group of 6 students decided to make [i]study groups[/i] and [i]service activity groups[/i] according to the following principle:

Each group must have exactly 3 members. For any pair of students, there are same number of study groups and service activity groups that both of the students are members.

Supposing there are at least one group and no three students belong to the same study group and service activity group, find the minimum number of groups.
1. **Label the students and define the groups:**
   Let the students be labeled as \(1, 2, 3, 4, 5, 6\). We need to form study groups and service activity groups such that each group has exactly 3 members, and for any pair of students, there are the same number of study groups and service activity groups that both students are members of.

2. **Construct the groups:**
   We can construct the following groups:
   - Study groups: \((1, 2, 3), (3, 4, 5), (5, 6, 1), (2, 4, 6)\)
   - Service activity groups: \((2, 3, 4), (4, 5, 6), (6, 1, 2), (1, 3, 5)\)

3. **Verify the conditions:**
   - Each group has exactly 3 members.
   - For any pair of students, the number of study groups and service activity groups they are both members of is the same.

4. **Show that fewer than 8 groups is not possible:**
   - **2 groups:** Clearly impossible because each group must have 3 members, and we have 6 students.
   - **4 groups:** Also impossible because it would not satisfy the condition that each pair of students is in the same number of study and service activity groups.
   - **6 groups (3 study and 3 service activity):** 
     - If no pair of students is in at least two study groups together, then the groups must share a common student, leading to a contradiction when partitioning into service activity groups.
     - If a pair of students is in three study groups together, it would violate the condition of having the same number of groups for each pair.
     - If a pair of students \((x, y)\) is in exactly two study groups together, the third study group can contain at most one of these students, leading to a contradiction when partitioning into service activity groups.

5. **Conclusion:**
   Therefore, the minimum number of groups required is 8.

The final answer is \(\boxed{8}\).