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Let Z be the set of integers and the map...

Let Z be the set of integers and the mapping `f:Z rarr Z` be defined by, `f(x):x^2`. State which of the following is equal to `f^(-1)(-4)`?

A

{2}

B

{-2}

C

{2,-1}

D

`phi`

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UNITED BOOK HOUSE-SET 13-EXERCISE
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