Online Course Support | Think Again I: How to Understand Arguments

Classify the following sentences as N, A, V, or B. In assessing soundness, you may assume commonly known facts.

 
 
Correct

ANSWER: B = an argument that is both valid and sound

It is not possible that Sao Paulo is in Brazil, and Brazil in in South America, but Sao Paulo is not in South America. Hence, this argument is valid. In addition, it is true (and commonly known) that Sao Paulo is in Brazil, and Brazil in in South America. Thus, this argument also has true premises, so it is sound.

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