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2 be logical

Introductory logic lessons 23-24

QuestionAnswer
A syllogism is VALID if and only if the premises ____________ the conclusion. imply
If a syllogism has true premises and a false conclusion, then it is ________________. invalid
Validity depends only on the _____________of the argument, NOT on the meaning or truth of individual statements. form
A ______________ syllogism is valid AND has true premises. SOUND
Because a sound syllogism is valid and has true premises, the conclusion must be ___________ as well. true
Statements are either true or false, while __________________ are valid or invalid. arguments
A _________________ to a syllogism has the same form as the original, but with obviously true premises & an obviously false conclusion. counterexample
The purpose of a counterexample is to expose the __________________ argument to be invalid. original
Do not assume a syllogism is invalid if you cannot think of a counterexample to it. You may simply just need to be more _____________________ . creative
When developing counterexamples, try starting with a false ____________________, then find a middle term that results in true premises. conclusion
Created by: MrsHough
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