The Savage Breast

A logic problem from Lewis Carroll: What conclusion follows from these premises?

Nobody who really appreciates Beethoven fails to keep silent while the Moonlight Sonata is being played.
Guinea pigs are hopelessly ignorant of music.
No one who is hopelessly ignorant of music ever keeps silent while the Moonlight Sonata is being played.

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Guinea pigs never really appreciate Beethoven. (From the unpublished manuscript of a second volume of Carroll’s Symbolic Logic, discovered by philosopher William Bartley.)