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M02-29

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Math Expert
Joined: 02 Sep 2009
Posts: 50623

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15 Sep 2014, 23:18
00:00

Difficulty:

15% (low)

Question Stats:

71% (00:27) correct 29% (00:26) wrong based on 179 sessions

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Is $$x = x^2$$?

(1) $$x \ne 0$$

(2) $$x \gt 1$$

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Math Expert
Joined: 02 Sep 2009
Posts: 50623

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15 Sep 2014, 23:18
Official Solution:

Is $$x=x^2$$?

Is $$x(x-1)=0$$? So, the question basically asks whether $$x=0$$ or $$x=1$$.

(1) $$x \ne 0$$. If $$x=1$$ then the answer is YES but if $$x$$ is any other number (except zero, which is ruled out) then the answer is NO. Not sufficient.

(2) $$x \gt 1$$. Both options ($$x=0$$ or $$x=1$$) are ruled out hence we know that $$x \ne x^2$$. Sufficient.

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Joined: 21 Apr 2015
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22 Apr 2015, 07:22
It is B - option one says nothing, just says not 0 so it could be 1 or anything else. 0^2 or 1^2 are x=x^2 , but the second option confirms that x =/= x^2. so B is sufficient.
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Joined: 08 Oct 2016
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14 Oct 2017, 03:19
hi should the answer to this ques not be e.?
Math Expert
Joined: 02 Sep 2009
Posts: 50623

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14 Oct 2017, 03:22
warpedhobbit wrote:
hi should the answer to this ques not be e.?

Why? The answer is B as explained here: https://gmatclub.com/forum/m02-183577.html#p1413805
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Re: M02-29 &nbs [#permalink] 14 Oct 2017, 03:22
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