3. a) Do the sets {1/n:n∈N} and {1/n:n∈N}∪N have the same cardinality?  Either givean explicit bijection between them or show that no such bijection exists. Do they have the same cardinality?Proof of answer: b) Do the sets [0,1] and [0,1]∪N have the same cardinality? Either give an explicit bijection between them or show that no such bijection exists. [Hint: Part (a) will be helpful!] Do they have the same cardinality? Proof of answer:

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