Statements:
Some songs are guitars.
Only guitars are music.
No song is an instrument.
Conclusions:
I. Some music are songs.
II. At least some guitars are instruments.
III. All music are guitars.
Only guitars are music → All music are guitars and music cannot have any positive relation with anyone. Hence conclusion I does not follow but conclusion III follows. Some song are guitars (I) → Conversion → Some guitars are song (I) + No song is instrument (E) → Some guitars are not instrument (O). Hence conclusion II does not follow.
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