Using Direct Method please check which of the following is valid statement *
p → q, q →r ⊢ ~p ∨ r
p ∨ q, ~p, q →r ⊢ r
(p → r) → ~s, q →r, p → q, s ∨ t ⊢ t
All of these
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q v3 sp p 245608@# Ethiopia treatment of movement of the 052
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