Show that the given statements are tautologies:
[(p ⇒ q) ^ (q ⇒ r)] ⇒ (p ⇒ r)
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Complete the following table:
Differentiate between proposition and wff.
[(p ⇒ q) ^ p] ⇒ q
From premises A ⇒ B and B ⇒ A, conclude B' + A.B.