Question: PLEASE NEED HELP WITH THESE!!! 5) [16 marks total] Write all elements of the power set for S={a,b,c,d}. 6) [9 marks total] Consider the expression

PLEASE NEED HELP WITH THESE!!!

5) [16 marks total] Write all elements of the power set for S={a,b,c,d}. 6) [9 marks total] Consider the expression (XY)(XY)=(XY)(XY) where X and Y are sets. a. [1 mark] Is the expression a tautology or a contradiction? b. [8 marks] Prove your answer for item a. without using a truth table

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