COMP1805ABC (Winter 2019) Discrete Structures I" Specification for Assignment 1 of 4 Using only the- and the A operators, find a logical expression that is equivalent to -(p A-r) c. For this question, you do not need to specify "how you found the equivalent expression because you will show both techniques in questions 5 and 6 below 4. (0.5 marks) Prove that the expression you found for question 4 above is equivalent to the expression (p -r-, c by using only truth tables. Show all your work and do not skip any steps (i.e, ensure you that you include a new column for every single operation). 5. (4.0 marks) 6. Prove that the expression you found for question 4 above is equivalent to the p ^-r ) c by using only the logical equivalences. Show all your (4.0 marks) expression-(p Ar)c by using only the logical equivalences work, labelling each rule used, and do not skip any steps