SRMJEE 2018 Paper with key

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Question : 71 of 147

Marks: +1, -0

A function f from the set of natural numbers to integers defined by
f(n)={

(n−1)

2

‌if‌n‌odd

−n

2

‌if‌n‌even

is:

one-one but not onto
onto but not one-one
one-one and onto both
neither one-one nor onto

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