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April 18, 2015

Homework Help: critical thinking

Posted by jessica on Tuesday, July 25, 2006 at 10:08pm.

is this an example of an invalid argument

All crows are black
John is black
Therefor, John is a crow.

is this an example of a unsound argument

All dogs are black
Lassie is a dog
Lassie is a cat

Please tell me if this is right.


You're right for both arguments.

The premise for the first statement is correct. But obviously the conclusion is wrong -- making the argument invalid.

The premise for the second argument is not correct. Therefore it is both invalid and unsound.

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