ACE test series

Question

A function f: Z⁺ ⟶ Z⁺ is defined by f(x)= maximum of n and 50.

which of the following is true?

A) f is one to one but not onto

B) f is onto but not one to one

C) f is bijection

D f is neither one to one nor onto

Comments

D. neither one one nor onto.

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maximum of n and 50 or x

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What is n here ,Is it supposed to be x?

If that is case option D

since in 1 to 49 will be mapped to 50 leaving 1 to 49 in domain unmapped.

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I considered as x.

Then yes 1 to 50 will map to 50.

51 and above will map to respective ones.

Which makes function not one one and not onto.

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I think it should be x instead of n, and D) should be the answer.

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in question its given n...may be its x..

thanks :)