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4) [15 marks] Consider the proposition (PQ)(PQ). Show that it is a contradiction by using both: a. [5 marks] the truth table, and b. [10

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4) [15 marks] Consider the proposition (PQ)(PQ). Show that it is a contradiction by using both: a. [5 marks] the truth table, and b. [10 marks] the logical equivalencies provided by Table 6 below

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