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13 Feb 2017, 00:43
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
92% (00:28) correct
8%
(00:34)
wrong
based on 13
sessions
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Not Attempted Yet
If (x - 1)(x - 2) = 0, x = ?
(1) x is even
(2) x is odd
(1) x is even
(2) x is odd
I have started preparing for GMAT recently and well I have got lots of questions that may seem(or is) stupid. I was studying DS with math revolution free trial and as they say that there has to be only one answer that is unique. And they had this example:
and there answer was D (each statement alone is sufficient). Shouldnt it be E cause we still dont know the value of x?
and there answer was D (each statement alone is sufficient). Shouldnt it be E cause we still dont know the value of x?
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13 Feb 2017, 01:51
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kuralaysn
If you observe the solution in the pic you have uploaded , you can see that X can be either 1 or 2. So at this stage we can decide its value.
But while solving for options, we have to solve each option individually without considering other option.
For example, while you are evaluating statement 1, you have to consider x is even but nothing else. So you get value of x as 2. that's it.
And then you move on to statement 2, forgetting all the information of statement 1 and only consider that x is odd and is 1.
the information given in main question is common to all the statements.(1&2)
i hope this helps.
You will get accustomed with the DS as you practice more.
13 Feb 2017, 01:59
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Given, (x-2)(x-1) = 0;
for the above equation to be true, either:
(x-2) = 0
=>x = 2
or:
(x-1) = 0
=>x = 1
Now,
(1) x is even;
So, we can clearly say x = 2 from the above roots; Hence Sufficient.
Again,
(2) x is odd;
So, we can clearly say x = 1 from the above roots; Hence Sufficient.
Answer D.
Cheers.
for the above equation to be true, either:
(x-2) = 0
=>x = 2
or:
(x-1) = 0
=>x = 1
Now,
(1) x is even;
So, we can clearly say x = 2 from the above roots; Hence Sufficient.
Again,
(2) x is odd;
So, we can clearly say x = 1 from the above roots; Hence Sufficient.
Answer D.
Cheers.
