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'Let `A` be a finite set. If `f: A-A` is a one-one function, show that `f` is onto also.'
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"Let `A`
be a finite set. If `f: A-A`
is a one-one function,
show that `f`
is onto also."
be a finite set. If `f: A-A`
is a one-one function,
show that `f`
is onto also."