12. (a) Show De Morgans law using Venn diagrams with a and b overlapping regions. Sketch the...
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12.
(a) Show De Morgan’s law using Venn diagrams with a and b overlapping regions. Sketch the following regions to show that region (2) is the same as region (5):
(1) a · b
(2) (a · b)′
(3) a′
(4) b′
(5) a′ + b′
(b) Do the dual of part (a).
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