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Problem 75

Determine whether each statement makes sense or does not make sense, and explain your reasoning. "All beagles are dogs" is true and "no beagles are dogs" is false, so the second statement must be the negation of the first statement.

Problem 76

Use grouping symbols to clarify the meaning of each statement. Then construct a truth table for the statement. \(q \rightarrow p \leftrightarrow p \vee q \rightarrow \sim p\)

Problem 78

Write an original argument in words for the contrapositive reasoning form.

Problem 83

Write each compound statement in symbolic form. Let letters assigned to the simple statements represent English sentences that are not negated. If commas do not appear in compound English statements, use the dominance of connectives to show grouping symbols (parentheses) in symbolic statements. I like the teacher, or if the course is interesting then I do not miss class.

Problem 87

Write each compound statement in symbolic form. Let letters assigned to the simple statements represent English sentences that are not negated. If commas do not appear in compound English statements, use the dominance of connectives to show grouping symbols (parentheses) in symbolic statements. If I like the teacher I do not miss class if and only if the course is interesting.

Problem 92

Explain when biconditional statements are true and when they are false.

Problem 93

Write each compound statement in symbolic form. Assign letters to simple statements that are not negated and show grouping symbols in symbolic statements. Filing an income tax report and a complete statement of earnings is necessary for each taxpayer or an authorized tax preparer.

Problem 96

Determine whether each statement makes sense or does not make sense, and explain your reasoning. The statement "If \(2+2=5\), then the moon is made of green cheese" is true in logic, but does not make much sense in everyday speech.

Problem 98

Determine whether each statement makes sense or does not make sense, and explain your reasoning. When asked the question "What is time?", the fourthcentury Christian philosopher St. Augustine replied, "If you don't ask me, I know, but if you ask me, I don't know." I constructed a truth table for St. Augustine's statement and discovered it is a tautology.

Problem 98

Use grouping symbols to clarify the meaning of each symbolic statement. \(p \wedge q \rightarrow r \leftrightarrow p \vee r\)

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