Discussion
By which of the following proposition, the proposition 'some men are not honest' is contradicted ?
Answer: A
The proposition 'some men are not honest' is an O proposition (particular negative). Its contradictory is the A proposition 'all men are honest', since the two always have opposite truth values. 'Some men are honest' is its subcontrary (the I proposition), which can be true together with it. 'No men are honest' (E) implies it, so it is a stronger statement and not its contradictory. So the contradicting statement is 'all men are honest', and 'all of the above' is wrong.
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