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Question

The solution set the inequation |[|x|7]|5<0, is [.] denotes the greatest integer function)

A
[3,12)
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B
(12,3)
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C
(12,12)
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D
(12,3][3,12)
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Solution

The correct option is B (12,3][3,12)
We have

|[|x|7]|<5
5<[|x|7]<5

4|x|7<5

3|x|<12

x(12,3][3,12)

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