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Determine whether each argument is valid or invalid. No \(A\) are \(B\), some \(A\) are \(C\), and all \(C\) are \(D\). Thus, some \(D\) are \(C\).

Short Answer

Expert verified
The argument 'Some \(D\) are \(C\)' is valid.

Step by step solution

01

Understand Relationships

First, interpret the given information about the relationship between the elements \(A\), \(B\), \(C\), and \(D\). We have three premises: 'No \(A\) are \(B\)', 'some \(A\) are \(C\)', and 'all \(C\) are \(D\)'.
02

Use Relationships to Verify Conclusion

Using the premises, we can say that since 'some \(A\)' are \(C\), and 'all \(C\)' are \(D\), it can be concluded that 'some \(D\)' must be \(C\). Hence, the argument 'Some \(D\) are \(C\)' is valid by the transitivity rule in logic, which states that if \(A\) is related to \(B\), and \(B\) is related to \(C\), then \(A\) is related to \(C\)
03

Confirming Validity of Argument

Since the provided conclusion, 'Some \(D\) are \(C\)', logically follows from the given premises, the argument can be confirmed as valid.

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Most popular questions from this chapter

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 differences 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. The invasion was a secret. \(\therefore\) No journalists learned about the invasion.

Determine whether each argument is valid or invalid. All \(A\) are \(B\), all \(B\) are \(C\), and all \(C\) are \(D\). Thus, all \(A\) are \(D\).

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 differences in past, present, and future tense.) If a metrorail system is not in operation, there are traffic delays. Over the past year there have been no traffic delays. \(\therefore\) Over the past year a metrorail system has been in operation.

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 differences in past, present, and future tense.) If it is hot and humid, I complain. It is not hot or it is not humid. \(\therefore\) I am not complaining.

Use Euler diagrams to determine whether each argument is valid or invalid. All dogs have fleas. Some dogs have rabies. Therefore, all dogs with rabies have fleas.

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