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1) 1/5 < 1/(x+1) < 1/2 or 2 < (x+1) < 5 or 1 < x < 4 x = 2 or 3 insufficient.
2) (x-3)(x-4) = 0 x=3 or 4 insufficient.
(1)+(2) --> x = 3 sufficient.
1/5 < 1/(x+1) < 1/2 or 2 < (x+1) < 5
How do you get this? Could you please explain
From 1/5 < 1/(x+1) we know that x+1 must be positive so, we can cross-multiply to get x+1 < 5. The same way from 1/(x+1) < 1/2 we get 2 < x+1. Therefore 2 < x+1 < 5.
Re: If x is an integer, what is the value of x? [#permalink]
08 Oct 2015, 09:08
Bunuel wrote:
If x is an integer, what is the value of x?
(1) 1/5 < 1/(1 + x) < 1/2 (2) (x – 3)(x – 4) = 0
Kudos for a correct solution.
(1) from this expression we can say x must be +ve -> 5>1+x>2 4>x>1 NOT Sufficient as x could be 2 or 3 (2) x=3 or 4 Not Sufficient (1+2) X=3 Answer (C) _________________
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