Find the point where the graph of the function Sgn (lnx) breaks (or becomes discontinuous)
(Sgn is the Signum function)

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Solution

The correct option is A
1

The graph of Sgn(x) is

It is discontinuous or breaks when x = 0

$\Rightarrow$ Sgn ( Inx) will be discontinuous (will break) when Inx = 0

or when x = 1 . Because that is when sgn(Inx) becomes zero.

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