alleryA function is invertible exactly when it is:
AConstant and onto
BOne-one and onto
COnto but not one-one
DOne-one but not onto
Answer & Solution
Correct answer: B. One-one and onto
1. If f is invertible, then f must be one-one and onto.
2. The converse also holds, so the two conditions match up.
3. So invertibility is the same as being one-one and onto.
_Source: syllabus Mathematics Part I, Chapter 1, Relations and Functions._
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