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Question

The set of real values of x satisfying |x1|12, is

A
[2,4]
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B
[2,4]
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C
[4,2]
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D
[1,)
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Solution

The correct option is B [2,4]
|x1|12
2|x1|12
1|x1|3
0|x1|3 (|x1|0 xR)
3x13
2x4

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