1. (a) Explain what is meant by the terms countable set anduncountable set. Give a concrete example of each.
b) Show that if A and B are countably infinite then the set A xB is also countably infinite.
c) Give an expression for the cardinality of set A U B when Aand B are both finite sets.
d) What can you say about the cardinality of the set A U B whenA and B are infinite sets.
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