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It is NOT a 'countable set'. It is an infinite set. 1, 3, 5, 7, 9, 11, ... you can count to infinity and keep going.
By definition, it is the set of all real numbers!
Are disjoint and complementary subsets of the set of real numbers.
all finite set is countable.but,countable can be finite or infinite
The set of Natural Numbers is the set of 'counting numbers' {1,2,3,4,....}. All of them are also real numbers.