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Question

The number of solution(s) of the equation sgn(lnx)=3 is
(Here, sgn denotes the signum function)

A
3
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B
4
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C
0
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D
2
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Solution

The correct option is C 0
sgn(lnx)=1, lnx<00, lnx=01, lnx>1sgn(lnx)=1, 0<x<10, x=11, 1<x<
sgn(lnx)=3 has no solution

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