Chapter 7, Level 1 Self-Quiz: HI

. Use the indirect truth table method to determine whether the following argument is valid or invalid.
[ P ⊃ (Q ⊃ S) ] ⊃ R
~ P
~ Q
~ S / ~ R

. Use the indirect truth table method to determine whether the following argument is valid or invalid.
~ (P ⊃ Q) ⊃ ~ (R · S)
P · Q
R / ~ S

. Use the indirect truth table method to determine whether the following argument is valid or invalid.
(R ⊃ Q) ⊃ ~ S
Q ⊃ S / R

. Use the indirect truth table method to determine whether the following argument is valid or invalid.
~ (~ R ⊃ ~ Q) ⊃ ~ S
Q ⊃ S / ~ R ⊃ S

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