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The function f:NrarrZ defined by f(n)=(n...

The function `f:NrarrZ` defined by `f(n)=(n-1)/(2)` when n is odd and `f(n)=(-n)/(2)` when n is even, is

A

one one but not onto

B

onto but not one one

C

one one onto

D

neither one one nor onto

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The correct Answer is:
3
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