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 Question from wilson, a student: what are the countable and uncountable sets?

Hi Wilson,

A set is countably infinite if its members can be matched, in a one to one way with the positive integers, 1, 2, 3, ...

A set is countable if it is either finite or countably infinite.

A set is uncountable if it is not countable.

I hope this helps,
Penny

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