Author 
Message 
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 49968

Question Stats:
65% (01:00) correct 35% (01:02) wrong based on 382 sessions
HideShow timer Statistics



Math Expert
Joined: 02 Sep 2009
Posts: 49968

Re: M2535
[#permalink]
Show Tags
16 Sep 2014, 01:24



Senior Manager
Status: Math is psychological
Joined: 07 Apr 2014
Posts: 422
Location: Netherlands
GMAT Date: 02112015
WE: Psychology and Counseling (Other)

Re: M2535
[#permalink]
Show Tags
30 Dec 2014, 09:02
Hey,
I didn't understand your point about [1]. This part in specific: Hence m=n*odd.
[1] says that m/n is odd and an integer. This should mean that m is a multiple of n, otherwise it wouldn't be an integer, right? So, in order to have an integer as the answer, both m and n should be even or odd, with m>n. But, since we now that it is odd, then both m and n should be odd, sth like 9/3=3. Which means that both m and n are odd, so we get that m is an odd integer and not an even integer. So, this is sufficient.
Where am I making the mistake..?



Math Expert
Joined: 02 Sep 2009
Posts: 49968

Re: M2535
[#permalink]
Show Tags
31 Dec 2014, 04:52
pacifist85 wrote: Hey,
I didn't understand your point about [1]. This part in specific: Hence m=n*odd.
[1] says that m/n is odd and an integer. This should mean that m is a multiple of n, otherwise it wouldn't be an integer, right? So, in order to have an integer as the answer, both m and n should be even or odd, with m>n. But, since we now that it is odd, then both m and n should be odd, sth like 9/3=3. Which means that both m and n are odd, so we get that m is an odd integer and not an even integer. So, this is sufficient.
Where am I making the mistake..? This is very simple: \(\frac{m}{n}\) is an odd integer > \(\frac{m}{n}=odd\) > \(m=n*\text{odd}\). If \(n=\text{odd}\) then \(m=\text{odd}\) (for example m=n=1) but if \(n=\text{even}\) then \(m=\text{even}\) (for example m=n=2). Not sufficient.
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Senior Manager
Status: Math is psychological
Joined: 07 Apr 2014
Posts: 422
Location: Netherlands
GMAT Date: 02112015
WE: Psychology and Counseling (Other)

Re: M2535
[#permalink]
Show Tags
31 Dec 2014, 05:23
Hmmm, I just saw my mistake. For some reason, I didn't think of options such as 10/2=5, 6/2=3, but only such as 4/2=2, 8/2=4. So, because my examples were of even numbers ending in another even number, I rejected the possibility of the integers being even. This is why picking numbers can sometimes be tricky...
Thank you.



Manager
Joined: 02 Jan 2016
Posts: 102

Re: M2535
[#permalink]
Show Tags
12 May 2018, 23:29
Hi Bunuel, I applied the generalized approach, Even No.* Even No. or Even No. * Odd No. = Even No. The same outcomes are also applicable for division too, Because I had read about this rule somewhere, So I assumed, here as the outcome of Division is Odd, both No.s have to be Odd. Is this rule for division correct ?



Math Expert
Joined: 02 Sep 2009
Posts: 49968

Re: M2535
[#permalink]
Show Tags
13 May 2018, 00:34
hero_with_1000_faces wrote: Hi Bunuel, I applied the generalized approach, Even No.* Even No. or Even No. * Odd No. = Even No. The same outcomes are also applicable for division too, Because I had read about this rule somewhere, So I assumed, here as the outcome of Division is Odd, both No.s have to be Odd. Is this rule for division correct ? Even/Even might be even, odd or not an integer at all. For example, 4/2 = 2 = even, 2/2 = 1 = odd, 2/4 = 1/2 = not an integer. Even/odd might be even, or not an integer at all. For example, 6/3 = 2 = even, 4/3 = not an integer. Odd/even is not an integer. Odd/odd is either an odd integer or not an integer at all. 49/7 = 7 = odd and 7/49 is not an integer.
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Senior Manager
Joined: 08 Jun 2013
Posts: 443
Location: India
GPA: 3.82
WE: Engineering (Other)

Re: M2535
[#permalink]
Show Tags
16 Jul 2018, 09:20
Bunuel wrote: If \(m\) and \(n\) are positive integers, then is \(m\) an even integer?
(1) \(\frac{m}{n}\) is an odd integer.
(2) \(m + n\) is an even integer. Solution : (1) m/n odd > Say m/n = k then K odd. m = n*k > m can be odd or even depending on whether n is odd or even. So (1) not sufficient. (2) m + n even then both can be even or both can be odd So (2) not sufficient. (1) and (2) together m + n = kn + n = n* (k+1) k+1 is even so n can be even or odd. Hence m can be even or odd. (1) and (2) together not sufficient. Ans E)
_________________
It seems Kudos button not working correctly with all my posts...
Please check if it is working with this post......
is it?....
Anyways...Thanks for trying



Manager
Joined: 27 Jul 2016
Posts: 72
WE: Consulting (Consulting)

Re: M2535
[#permalink]
Show Tags
16 Jul 2018, 20:18
Statement 1: consider (2,6) and (3,9) the answer is yes and no Statement 2: consider the same sets the answer is yes and no
If 2 statements are combined: the answer can be both yes and no
Then E



Manager
Joined: 25 Jul 2017
Posts: 97

Re: M2535
[#permalink]
Show Tags
16 Jul 2018, 21:26
Bunuel wrote: If \(m\) and \(n\) are positive integers, then is \(m\) an even integer?
(1) \(\frac{m}{n}\) is an odd integer.
(2) \(m + n\) is an even integer. For this type of questions, I always prefer solving by examples. From Statement 1: m/n is odd take m=(1,2) and n = (1/2) respectively. => in both scenarios, m/n = 1 but m could be either 1 or 2 = Not sufficient From Statement 2: It simply states both m & n are either odd or even  not Suffieint even if we combine both, that is both m & n are odd (take 1,1) or even (take 2,2) we don't get definite answer. Hence, Answer is E










