14. Find: An (I n R) =, 15. Find: ( A -1) U(1-R)= 16. Find: A' – ( I' - R') = 17. Find: U - (A'n l') = 18. Find: (RnI)' – A =, 19. Find: U- ((A UI)UR) = 20. Find: (A U I)n ( A U R) =

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