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    MHB Find Proofs for the following 5 propositional logic statements

    i came acroos the below while studying propositional Logic, can anyone find the proofs 1) P ⊢ P 2) P → Q, Q→R ⊢ P → R 3) P → Q, Q→R, ¬R ⊢ ¬P 4) Q→R ⊢ (PvQ) → (PvR) 5) P →Q ⊢ (P&R) → (Q&R)