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Question

The solution set of |x2|1|x2|20 is:

A
(0,1](3,4)
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B
[0,1][3,4]
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C
[0,1](3,4)
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D
None of these
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Solution

The correct option is B (0,1](3,4)
If x2>0, then x>2
i. e. x(2,)
|x2|=x2
x21x220
=x3x40
x[3,4)
If x2<0, then x<2
i. e.x(,2)
|x2|=(x2)=2x
2x12x20
=1xx0
=x1x0
x(0,1]
x(0,1](,2)
x(0,1]
Solution set =(0,1][3,4)

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