Some epicures are ungenerous;
All my uncles are generous.
My uncles are not epicures.
Univ. “persons”; m = generous; x = epicures; y = my uncles.
Some x are m′. All y are m. All y are x′. | ∴ Some x are y′. |
Hence proposed Conclusion is wrong, the right one being “Some epicures are not uncles of mine.”
5.
Gold is heavy;
Nothing but gold will silence him.
Nothing light will silence him.
Univ. “things”; m = gold; x = heavy; y = able to silence him.
All m are x; No m′ are y. No x′ are y. | ∴ No x′ are y. |
Hence proposed Conclusion is right.