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B
one-one and onto
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C
many – one and onto
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D
one – one and into
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Solution
The correct option is Amany – one and into Since, f (x + iy) = f (x - iy) ∴ f is many – one Also, Range =R+ and codomain = R. ∴ Range ⊏ codomain ⇒ f is into. Hence, f is many – one into.