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1. Simplify (q vr) V (pA~r). Indicate, at each step, which logical equivalence law is used. 2. Use truth table to determine whether the given

1. Simplify (q vr) V (pA~r). Indicate, at each step, which logical equivalence law is used. 2. Use truth table to determine whether the given argument form is valid or invalid pV~q rV~

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