Question: Question 3 . Logical Equivalence [ 1 0 MARKs ] Prove that each of the following is a tautology. Do not use truth tables. PharrP

Question 3. Logical Equivalence [10 MARKs]
Prove that each of the following is a tautology. Do not use truth tables.
PharrP
((ab)??(bc))(ac)
((ab)??(notbnota))harr(ab)
(a??(ab))b
Question 3 . Logical Equivalence [ 1 0 MARKs ]

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