Maths-
General
Easy
Question
The mapping
given
where N is the set of natural number, is
- One-to-one and onto
- Onto but not one-to-one
- One-to-one but not onto
- Neither one-to-one nor onto
The correct answer is: One-to-one but not onto
Since, 
For one-to-one, 

is one-to-one.
But
is not onto as every element of codomain is not the image of any element of domains.
Hence,
is one-to-one but not onto
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