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Question

Solution set of (x2āˆ’1)(x3āˆ’1)(x4āˆ’1)>0 is

A
(1,)
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B
(1,)
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C
[1,)
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D
[1,)
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Solution

The correct option is A (1,)
(x21)(x31)(x41)>0(x+1)(x1)(x1)(x2+x+1)(x+1)(x1)(x2+1)>0(x2+1)(x2+x+1)(x+1)2(x1)3>0(x1)3>0x>1

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