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11 Nov 2010, 11:35
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What is \(X\) ?
1. \(X^2 - 1 = X + 1\)
2. \(X + 3\) is a prime number
(C) 2008 GMAT Club - [t]m08#36[/t]
* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient
Statement (1) by itself is insufficient. From S1, \(X\) is either 2 or -1. Be careful not to cancel out the factor \((X + 1)\) for it can equal 0.
Statement (2) by itself is insufficient. S2 does not help to determine whether \(X\) is -1 or 2 as both 2 and 5 are primes.
The correct answer is E.
-1+2 =1 which is prime, therefore C should be the correct anser - please amend.....thanks
1. \(X^2 - 1 = X + 1\)
2. \(X + 3\) is a prime number
(C) 2008 GMAT Club - [t]m08#36[/t]
* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient
Statement (1) by itself is insufficient. From S1, \(X\) is either 2 or -1. Be careful not to cancel out the factor \((X + 1)\) for it can equal 0.
Statement (2) by itself is insufficient. S2 does not help to determine whether \(X\) is -1 or 2 as both 2 and 5 are primes.
The correct answer is E.
-1+2 =1 which is prime, therefore C should be the correct anser - please amend.....thanks
Archived Topic
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12 Nov 2010, 10:46
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The correct answer is E.
Here is the explanation.
Statement 1:
x^2-1 = x +1
x^2-1-x-1 = 0
x^2-x-2 = 0
(x-2) (x+1) = 0
Here x is either 2 or -1. Not sufficient.
Statement 3: X+3 is prime number. X xould be any number like 2,4,8...etc. So Not sufficient.
Together: If we consider statement 1 and 2 togather.
x=2 , X+3 = 5 is prime -- True
x=-1, x+3 = -1+3 = 2 is prime --True.
Again we get two solutions for x (2 or -1). Which is insuffient to find x.
So the answer is E.
hope this helps.
Here is the explanation.
Statement 1:
x^2-1 = x +1
x^2-1-x-1 = 0
x^2-x-2 = 0
(x-2) (x+1) = 0
Here x is either 2 or -1. Not sufficient.
Statement 3: X+3 is prime number. X xould be any number like 2,4,8...etc. So Not sufficient.
Together: If we consider statement 1 and 2 togather.
x=2 , X+3 = 5 is prime -- True
x=-1, x+3 = -1+3 = 2 is prime --True.
Again we get two solutions for x (2 or -1). Which is insuffient to find x.
So the answer is E.
hope this helps.
13 Nov 2010, 03:03
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mads
yes - i agree. who should i contact to change the OA on the test?
Archived Topic
Hi there,
Archived GMAT Club Tests question - no more replies possible.
Where to now? Try our up-to-date Free Adaptive GMAT Club Tests
for the latest questions.
Still interested? Check out the "Best Topics" block above for better discussion and related questions.
Thank you for understanding, and happy exploring!
