Greeting card 1 2 3 4
A2 B 1 C4 D3
A2 B3 C4 D 1
There are three situations when students A2 B4 C 1 D3 A take the exam 2. Similarly, there are three situations in A3 and A4.
So there are nine kinds of one * * *
Classmate A B C D E
Greeting card 1 2 3 4 5
A2 B 1 D3 E4 C5
A2 B1E3 C4 D5
A2 C 1 (not listed)
A2 D 1 (not listed).
A2 E 1 (not listed).
When a student gets 2, there are 8 situations. Similarly, there are 8 situations in A3, A4 and A5.
So there are 32 kinds of a * * *