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The signum function f:RtoR defined as f(...

The signum function `f:RtoR` defined as `f(x)={{:(1",",xlt0),(0",",x=0),(-1",",xlt0):}`is :

A

one -one but not onto

B

onto but not one -one

C

both one -one and onto

D

neither one -one nor onto

Text Solution

Verified by Experts

The correct Answer is:
D
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