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Determine Whether the Following Symbolized Argument Is Valid or Invalid \rarr

Question 39

Short Answer

Determine whether the following symbolized argument is valid or invalid.If invalid,provide a counterexample;if valid,construct a deduction.
P \rarr Q
Q \rarr R
R \rarr S
(P \rarr S) \rarr (Q \rarr ~P)
~P/ \therefore ~Q

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Invalid.
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