
Concept explainers
In Exercises 15-42, translate each argument into symbolic form. Then determine whether the argument is valid or invalid. You may use a truth table or, if, applicable, compare the argument’s symbolic form to a standard valid or invalid form. (You can ignore difference in past, present, and future tense.)
If some journalists learn about the invasion, the newspapers will print the news.
If the newspapers print the news, the invasion will not be a secret.

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Chapter 3 Solutions
Thinking Mathematically (7th Edition)
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