An argument form is invalid if and only if,
A. it has no substitution instances with true premises and a false conclusion
B. it has substitution instances with true premises and a false conclusion
C. it has no substitution instances with false premises and a true conclusion
D. it has substitution instances with false premises and a true conclusion
Answer: Option B
This Question Belongs to Philosophy >> Basic Logic Concepts In Philosophy
What is said to be the building blocks of our reasoning?
A. Proposition
B. Statement
C. Argument
D. Explanation
What do you mean by a term which is undistributed?
A. Excellence of some members of a class
B. Exclusion of some members of a class
C. Exclusion of many members
D. Inclusion of many members
The subaltern of the proposition 'Some scientists are mathematicians' are
A. Some scientists are not mathematicians
B. No scientists are mathematicians
C. All scientists are mathematicians
D. None of the above
A. 1 and 3
B. 1 and 2
C. 2 and 3
D. 1 and 4
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