alleryIf a function f is invertible, then f must be:
AConstant on its domain
BOne-one but not onto
COne-one and onto
DOnto but not one-one
Answer & Solution
Correct answer: C. One-one and onto
1. Invertibility asks for a function undoing f on both sides.
2. That forces every image to be hit and no image to be shared.
3. So an invertible f is one-one and onto.
_Source: syllabus Mathematics Part I, Chapter 1, Relations and Functions._
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