Calligraphy and model airplanes

Calligraphy and art

Calligraphy and music

Model plane and art

Model planes and music

Art and music

calligraphy

model plane

art

music

Sit outside

(3+2+1)+4+1=1/(species)

Just one more drink.

11+1=12 (person)

Answer: Only among 12 students can two or more students participate in interest groups in exactly the same way.