Question: 8. (i.) Every (ii.) Not every (iii.) No substitution instance of the following argument form is invalid: Argument form: P1: If (p or q) then

8. (i.) Every (ii.) Not every (iii.) No substitution instance of the following argument form is invalid: Argument form: P1: If (p or q) then not-r P2: Not (p or q) C: r

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