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stonecold
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Joined: 12 Aug 2015
Last visit: 09 Apr 2024
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Given Kudos: 893
Schools: Boston U '20 (M)
GRE 1: Q169 V154
21 Aug 2016, 07:33
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
55% (01:19) correct
45%
(01:14)
wrong
based on 183
sessions
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Is the integer z divisible by 6?
(1) The greatest common factor of z and 2 is 2.
(2) The greatest common factor of z and 15 is 5.
(1) The greatest common factor of z and 2 is 2.
(2) The greatest common factor of z and 15 is 5.
21 Aug 2016, 09:29
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stonecold
Is the integer z divisible by 6?
(1) The greatest common factor of z and 2 is 2.
(2) The greatest common factor of z and 15 is 5.
(1) The greatest common factor of z and 2 is 2.
(2) The greatest common factor of z and 15 is 5.
Statement I tells us that z is a multiple of 2, but we can't say if it is also a multiple of 3 or not..
Insuff...
Statement II tells us that z and 15 have 5 in common, so z is not a multiple of 3 as 15 is a multiple of 3..
So z is not div by 3 and hence not div by 6..
Ans is NO..
Suff..
B
21 Aug 2016, 10:40
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stonecold
Is the integer z divisible by 6?
(1) The greatest common factor of z and 2 is 2.
(2) The greatest common factor of z and 15 is 5.
(1) The greatest common factor of z and 2 is 2.
(2) The greatest common factor of z and 15 is 5.
Easy one.
We need to find out whether Z has 2 and 3 as its factors.
(1) The greatest common factor of z and 2 is 2. --> It tells Z has 2 in it but not sure of 3. hence, insufficient.
(2) The greatest common factor of z and 15 is 5 --> It tells Z doesn't have 3 , hence it will never be divisible by 6. hence, Sufficient
Answer is B.
