Maths · One-one, into and onto functions
An identity function is a?
An identity function is a?
- A. Many to many function
- B. One to One function
- C. Many to one function
- D. None
Step-by-step solution
An identity function maps each element to itself. It is injective (one-to-one) because if f(x)=f(y) then x=y, and it is surjective onto its domain. Therefore, it is a one-to-one function.
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