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Let f: I rarr I be defined by f(x) = x +...

Let `f: I rarr I` be defined by` f(x) = x + k` where k is a fixed integer and I is the set of all integers then f is

A

one-one but not onto

B

onto but not one-one

C

does not have an inverse

D

both one-one and onto

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The correct Answer is:
D
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