Use indirect truth tables to determine whether the following arguments are valid or invalid. a) ~A ⊃ ~(~B • C) D ⊃ ~B E ⊃ ~(F • ~G) E v D -------------------- F • A   b) (Z v W) ⊃ (X v Y) X ⊃ (Y • U) (U v V) ⊃ T -------------------- Z ⊃ G   c) A ⊃ (F v G) F ⊃ (D v S) G ⊃ (M v D) (M v S ) ⊃ D -------------------- A ⊃ D

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