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25 May 2022, 01:30
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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:
70% (01:21) correct
30%
(01:10)
wrong
based on 66
sessions
History
Date
Time
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If z~ denotes the greatest integer less than or equal to z, is z~ = 1 ?
(1) \(8z - 1 = -13 + 5z\)
(2) \(1 < z < 2\)
(1) \(8z - 1 = -13 + 5z\)
(2) \(1 < z < 2\)
25 May 2022, 02:48
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If z~=1, then 1<=z<2
(1)Only
We should be able to solve for z, and then surely we can answer the question.
Sufficient. No need to actually solve for z.
Now, Let's actually solve for z.
3z=-12
z=-4
We can answer "No" to the question: is z~ = 1
(2)Only
We can answer "YES" to the question.
So, while the answer is thus "(D)", the contradiction between (1) and (2) is unexpected for a GMAT DS question.
(1)Only
We should be able to solve for z, and then surely we can answer the question.
Sufficient. No need to actually solve for z.
Now, Let's actually solve for z.
3z=-12
z=-4
We can answer "No" to the question: is z~ = 1
(2)Only
We can answer "YES" to the question.
So, while the answer is thus "(D)", the contradiction between (1) and (2) is unexpected for a GMAT DS question.
10 Nov 2022, 21:30
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zhanbo
zhanbo in the 2nd statement, the answer is always "No" because according to the statement z will always be greater than 1, which is quite the opposite to the stem.
