Give an example to show that a union of countable sets need not be countable. (Obviously...

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Give an example to show that a union of countable sets need not be countable. (Obviously your example must involve infinitely many sets.)
4. Give an example to show that a union of countable sets need not be countable. (Obvi- ously your example must involve infin

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som Here we take all possible subsets af set of natural number let it denoted by set At Now all such A are countable sest set

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