Maths-
General
Easy
Question
If 
- one-one onto function
- an onto function only
- an identity function
- an into function only
Hint:
In this question, we have to find the type of function if 
A function 
is said to be one-one if different elements of A have different images in B, a function is said to be onto if for all 
, there exists 
such that f (x) = y, and a function is said to be an identity function if the function is both one-one and onto.
The correct answer is: an identity function
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