A logic problem by Breno Linhares
Given the propositions:
1) Every woman is good driver.
2) No man is good driver.
3) All men are bad drivers.
4) At least one man is bad driver.
5) All men are good driver.
The denial of (5) is:
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The denial of statement 5 is no every man is a good driver. It means at least one man is bad driver. No (for every x, y) is equal to (there exists at least one x, no y)