The greatest integer function \( f: R \rightarrow R \), given by \( f(x)=[x] \) is : (A) one-one...

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The greatest integer function \( f: R \rightarrow R \), given by \( f(x)=[x] \) is :
(A) one-one
(B) onto
(C) both one-one and onto
(D) neither one-one nor onto
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