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27 Nov 2015, 22:40
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Is (x 7 )(y 2 )(z 3 )>0 ?
(1) yz<0
(2) xz>0
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
Above question is given in free gmat practice tests. I feel the answer is B But they have given answer as C.
(x 7 )(y 2 )(z 3 ) It can be simplified as follows
(x^6*y^2*z^2) (xz)
------------------
Underlined portion is always positive.
SO if XZ>0 it is sufficient
1) is insufficient
2)is sufficient
Correct me if I am wrong
(1) yz<0
(2) xz>0
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
Above question is given in free gmat practice tests. I feel the answer is B But they have given answer as C.
(x 7 )(y 2 )(z 3 ) It can be simplified as follows
(x^6*y^2*z^2) (xz)
------------------
Underlined portion is always positive.
SO if XZ>0 it is sufficient
1) is insufficient
2)is sufficient
Correct me if I am wrong
28 Nov 2015, 01:18
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ashokingmat
\((x^6*y^2*z^2)\) will always be \(\geq\) 0
It is not necessary that it will be positive
If the value of y = 0, then\((x^6*y^2*z^2)\) = 0
Hence \((x^7 )(y^2 )(z^3 )\) = 0
So, statement 2 is insufficient.
28 Nov 2015, 13:35
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Hi ashokingmat,
You'll likely get more of a response if you post this question in the DS Forum:
gmat-data-sufficiency-ds-141/
GMAT assassins aren't born, they're made,
Rich
You'll likely get more of a response if you post this question in the DS Forum:
gmat-data-sufficiency-ds-141/
GMAT assassins aren't born, they're made,
Rich
