|
Author |
Message |
|
TAGS:
|
|
|
Current Student
Joined: 29 Jan 2005
Posts: 5289
Followers: 17
Kudos [?]:
90
[0], given: 0
|
Here`s a strange one.... If y is a positive integer, is 3y [#permalink]
 22 Apr 2006, 23:30
Question Stats:
0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
Here`s a strange one....
If y is a positive integer, is 3y odd?
1. y+319 is even
2. y cannot be evenly divided by any odd number other than 1.
|
|
|
|
|
|
|
VP
Joined: 29 Apr 2003
Posts: 1414
Followers: 2
Kudos [?]:
10
[0], given: 0
|
Answer is D!
1. y+319 = even, hence y is odd (odd + odd --> even). Thus 3y = oddxodd = odd!
2. Y is not an odd number. If it is odd, then Y should be divisible by 1 and by itself which is also odd!. But it says it is not divisble by any odd number, save 1. Thus it has to be even. Thus the 3x even = even!
Usually in GMAT both the options are congruent, ie they yield the same results. Here option 1 seems to indicate odd, while option 2 seems to indicate even! Thats kind of Weird for GMAT.
Where did you get this Q from? I have not seen this one in Kaplan though, which Kaplan is it?
|
|
|
|
|
|
VP
Joined: 29 Dec 2005
Posts: 1356
Followers: 6
Kudos [?]:
17
[0], given: 0
|
Re: WEIRD Kaplan DS [#permalink]
23 Apr 2006, 07:54
GMATT73 wrote: Here`s a strange one....
If y is a positive integer, is 3y odd?
1. y+319 is even
2. y cannot be evenly divided by any odd number other than 1.
since y is a +ve integer,
from i, y is odd. so suff..
from ii, y is 1. also suff.
if y = 2, then 2 is evenly divided by 1 and 2. so only integer that is evenly (i guess evenly here doesnot mean 2, 4, 6 or so on) divided only by 1 is 1.
great question. D.
|
|
|
|
|
|
Senior Manager
Joined: 22 Nov 2005
Posts: 483
Followers: 1
Kudos [?]:
3
[0], given: 0
|
Re: WEIRD Kaplan DS [#permalink]
23 Apr 2006, 21:12
Professor wrote: GMATT73 wrote: Here`s a strange one....
If y is a positive integer, is 3y odd?
1. y+319 is even
2. y cannot be evenly divided by any odd number other than 1. since y is a +ve integer, from i, y is odd. so suff.. from ii, y is 1. also suff. if y = 2, then 2 is evenly divided by 1 and 2. so only integer that is evenly (i guess evenly here doesnot mean 2, 4, 6 or so on) divided only by 1 is 1. great question. D. Great explanation professor.
|
|
|
|
|
|
Intern
Joined: 18 Apr 2006
Posts: 1
Followers: 0
Kudos [?]:
0
[0], given: 0
|
Well, it says it cannot be evenly divided by any ODD integer other than 1. So it may well be divisible by 2.
A
|
|
|
|
|
|
Director
Joined: 08 Jun 2004
Posts: 506
Location: Europe
Followers: 1
Kudos [?]:
6
[0], given: 0
|
Maxi2006 wrote: Well, it says it cannot be evenly divided by any ODD integer other than 1. So it may well be divisible by 2.
A
Be careful, evenly divided means divided without a remainder.
So the answer is 'D'.
|
|
|
|
|
|
Current Student
Joined: 29 Jan 2005
Posts: 5289
Followers: 17
Kudos [?]:
90
[0], given: 0
|
Here is the confusing part with the wording in statement 2.
---> y can either be 1 or an even number (2, 4, 8 ...) because they all divide evenly.
** If y = 1, then the answer to the stem is a definate YES.
<but>
** If y is an even number (also divisible by 1), then the answer to the stem is a definate NO.
Given these two possible conditions, how can both statements be sufficient (D)  
BTW: This is from the "2005 Border`s Exclusive Edition" Kaplan prep text.
Last edited by GMATT73 on 24 Apr 2006, 07:22, edited 2 times in total.
|
|
|
|
|
|
SVP
Joined: 24 Sep 2005
Posts: 1913
Followers: 6
Kudos [?]:
55
[0], given: 0
|
Re: WEIRD Kaplan DS [#permalink]
24 Apr 2006, 07:12
GMATT73 wrote: Here`s a strange one....
If y is a positive integer, is 3y odd?
1. y+319 is even
2. y cannot be evenly divided by any odd number other than 1.
statement 2 means y is divisible by one and only one odd number that is 1.
--> y can be 1 and 2 ( 4, 8 and all exponents of 2)
--> 3y can be either odd or even
--> insuff
A it should be.
|
|
|
|
|
|
Senior Manager
Joined: 24 Jan 2006
Posts: 256
Followers: 1
Kudos [?]:
2
[0], given: 0
|
D is the answer.
From 1st option > we get 3y is odd
from 2nd option > y is even and 3y is even so suff.
|
|
|
|
|
|
SVP
Joined: 24 Sep 2005
Posts: 1913
Followers: 6
Kudos [?]:
55
[0], given: 0
|
but from statement 2, y can also be 1
|
|
|
|
|
|
Current Student
Joined: 29 Jan 2005
Posts: 5289
Followers: 17
Kudos [?]:
90
[0], given: 0
|
Thanks for backing me up here Laxie  Any other input guys?
|
|
|
|
|
|
SVP
Joined: 03 Jan 2005
Posts: 2322
Followers: 9
Kudos [?]:
157
[0], given: 0
|
I agree. y=1 satisfies the second condition so we don't really know if 3y is odd or even for that one. In other word the answer should be A.
_________________
Keep on asking, and it will be given you;
keep on seeking, and you will find;
keep on knocking, and it will be opened to you.
|
|
|
|
|
|
Manager
Joined: 13 Dec 2005
Posts: 226
Location: Milwaukee,WI
Followers: 1
Kudos [?]:
6
[0], given: 0
|
yes the answer should be A
for B 1 and all other even numbers can satisfy the criteria ...
|
|
|
|
|
|
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5134
Location: Singapore
Followers: 9
Kudos [?]:
87
[0], given: 0
|
3y is odd only if y is odd. So the question si asking if y is odd.
1) y+319 is even. 319 is odd. So y must be odd. Sufficient.
2) y is prime, which could be odd (any primes other than 2) or not odd(the prime number 2). Insufficient.
Ans A
|
|
|
|
|
|
Manager
Joined: 27 Mar 2006
Posts: 139
Followers: 1
Kudos [?]:
0
[0], given: 0
|
Re: WEIRD Kaplan DS [#permalink]
24 Apr 2006, 20:57
GMATT73 wrote: Here`s a strange one....
If y is a positive integer, is 3y odd?
1. y+319 is even
2. y cannot be evenly divided by any odd number other than 1.
good question...what is the OA?
|
|
|
|
|
|
Intern
Joined: 16 Apr 2006
Posts: 26
Followers: 0
Kudos [?]:
0
[0], given: 0
|
I read ii to mean y is prime as well but since it does not exclude 2 than it is not suff so A
|
|
|
|
|
|
Current Student
Joined: 29 Jan 2005
Posts: 5289
Followers: 17
Kudos [?]:
90
[0], given: 0
|
The OA, according to Kaplan is (D). I am still not convinced...
|
|
|
|
|
|
SVP
Joined: 24 Sep 2005
Posts: 1913
Followers: 6
Kudos [?]:
55
[0], given: 0
|
GMATT73 wrote: The OA, according to Kaplan is (D). I am still not convinced... But as we know, Kaplan is sometimes very erroneous 
|
|
|
|
|
|
VP
Joined: 29 Dec 2005
Posts: 1356
Followers: 6
Kudos [?]:
17
[0], given: 0
|
laxieqv wrote: GMATT73 wrote: The OA, according to Kaplan is (D). I am still not convinced... But as we know, Kaplan is sometimes very erroneous buddy, our math experts has cleared the confusion and misconception that D is not correct.
it was indeed a great discussion.
|
|
|
|
|
|
SVP
Joined: 24 Sep 2005
Posts: 1913
Followers: 6
Kudos [?]:
55
[0], given: 0
|
Professor wrote: laxieqv wrote: GMATT73 wrote: The OA, according to Kaplan is (D). I am still not convinced... But as we know, Kaplan is sometimes very erroneous buddy, our math experts has cleared the confusion and misconception that D is not correct. it was indeed a great discussion. buddy, this time, the merit goes to Matt as he pointed out the confusion and put forward a thorough consideration 
If we stay alert like Matt, keeping an eye on any trickiness of GMAT, we'll certainly ace the maths section
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
close
