Which arguments are not valid? (1) [( p → q ) ∧ ~ q ] → ~ p (2) [( p → q ) ∧ ~ p ] → ~ q (3) [( p → q ) ∧ q ] → p (4) [( p → q ) ∧ p ] → q

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Which arguments are not valid?

(1) [(p

→

q) ∧

q] →

(2) [(p → q

)

∧

p] →

(3) [(p

→

q) ∧ q] → p

(4) [(p

→

q) ∧ p

]

→ q

(1) and (3)

(1) and (4)

(1) and (2)

(2) and (3)

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