MCQ
$f: N \rightarrow N$, is defined by $f(x)=x^6$ then, ___________ .
- A$f$ is one-one and onto
- B$f$ is many-one and onto
- ✓$f$ is one-one but onto
- D$f$ is not one-one and onto
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If order of A + B is n × n, then the order of AB is: