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which of the following is correct:

1. countable sets are closed under union.

2. countable sets are closed under intersection.

3. countable sets are closed under set difference.

4. countable sets are closed under kleene closure.

5. countable sets are closed under concatenation.

6. countable sets are closed under complementation.
asked | 26 views
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nice question :)

I think all are correct
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@srestha mam And what if these sets are countably infinite...?
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what u think then answer will be ?
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they are closed :p

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