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Statement truth values


ashyam41

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I came across this problem in 5th edition of REA's GRE CS practice book.

 

Assume I and II are statements that have well-defined truth values i.e. each statement is either true or false and not both. Then this question on the test can be answered without further information, since there must be a unique correct answer.

 

A) I and II are both false

B) I is true, II is false

C) I is false, II is true

D) I and II are both true

E) If I is false, II is false

 

It's obvious that E is definitely not the right answer but how can we prove that one of the above answers is right?

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