Last visit was: 28 Apr 2026, 11:29 It is currently 28 Apr 2026, 11:29
Home
Messages
Tests
Schools
Events
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Events & Promotions
Back to Forum
Create Topic
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 28 Apr 2026
Posts: 109,950
Own Kudos:
811,763
 [6]
Given Kudos: 105,927
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,950
Kudos: 811,763
 [6]
How many odd numbers are there between m and n? 19 Jan 2017, 12:09
2
Kudos
Add Kudos
4
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

75% (hard)

Question Stats:

41% (01:35) correct 59% (01:33) wrong based on 95 sessions

History

Date
Time
Result
Not Attempted Yet
How many odd numbers are there between m and n?

(1) m – n = 9
(2) m is a positive integer.
ShowHide Answer
Official Answer
C
User avatar
BillyZ
User avatar
Current Student
Joined: 14 Nov 2016
Last visit: 24 Jan 2026
Posts: 1,135
Own Kudos:
22,616
Given Kudos: 926
Location: Malaysia
Concentration: General Management, Strategy
Schools: Sloan '23 (D) Tuck '23 (D) Darden '23 (D) Ross '23 (D) Kellogg '23 (D) Wharton '23 (D) Booth '23 (D) Fuqua '24 (A) Harvard '24 (D) Stanford '24 (D)
GMAT 1: 750 Q51 V40 (Online)
GPA: 3.53
Products:
My Reviews
Schools: Sloan '23 (D) Tuck '23 (D) Darden '23 (D) Ross '23 (D) Kellogg '23 (D) Wharton '23 (D) Booth '23 (D) Fuqua '24 (A) Harvard '24 (D) Stanford '24 (D)
GMAT 1: 750 Q51 V40 (Online)
Posts: 1,135
Kudos: 22,616
How many odd numbers are there between m and n? 19 Jan 2017, 16:31
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
How many odd numbers are there between m and n?

(1) m – n = 9
(2) m is a positive integer.
Show more

(1) m-n=9

Example

29 - 20 = 9, Odd integer = 21 23 25 27 29
0 - (-9) = 9, Odd integer = -1 -3 -5 -7 -9
17 - 8 = 9, Odd integer = 9 11 13 15 17
24 - 15 = 9, Odd integer = 15 17 19 21 23

Therefore, we can say that there is 5 odd numbers between m & n. Sufficient.

(2) m is a positive integer. No info about n. Insufficient.

Answer : A
User avatar
ShashankDave
User avatar
Joined: 03 Apr 2013
Last visit: 26 Jan 2020
Posts: 215
Own Kudos:
303
Given Kudos: 872
Location: India
Concentration: Marketing, Finance
Schools: McDonough '21 (A) Kelley '21 ISB '21 (I)
GMAT 1: 740 Q50 V41
GPA: 3
Schools: McDonough '21 (A) Kelley '21 ISB '21 (I)
GMAT 1: 740 Q50 V41
Posts: 215
Kudos: 303
How many odd numbers are there between m and n? 11 Mar 2017, 04:27
Kudos
Add Kudos
Bookmarks
Bookmark this Post
ziyuen
Bunuel
How many odd numbers are there between m and n?

(1) m – n = 9
(2) m is a positive integer.

(1) m-n=9

Example

29 - 20 = 9, Odd integer = 21 23 25 27 29
0 - (-9) = 9, Odd integer = -1 -3 -5 -7 -9
17 - 8 = 9, Odd integer = 9 11 13 15 17
24 - 15 = 9, Odd integer = 15 17 19 21 23

Therefore, we can say that there is 5 odd numbers between m & n. Sufficient.

(2) m is a positive integer. No info about n. Insufficient.

Answer : A
Show more
The answer is C.
Your case will only be true when both m and n are integers..but that has not been stated in the question. Try 2.3 and 11.3 --> 3,5,7,9,11. And the integers have to be between the values excluding the ends. Bunuel please confirm.
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 28 Apr 2026
Posts: 109,950
Own Kudos:
811,763
Given Kudos: 105,927
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,950
Kudos: 811,763
How many odd numbers are there between m and n? 11 Mar 2017, 04:44
Kudos
Add Kudos
Bookmarks
Bookmark this Post
ShashankDave
ziyuen
Bunuel
How many odd numbers are there between m and n?

(1) m – n = 9
(2) m is a positive integer.

(1) m-n=9

Example

29 - 20 = 9, Odd integer = 21 23 25 27 29
0 - (-9) = 9, Odd integer = -1 -3 -5 -7 -9
17 - 8 = 9, Odd integer = 9 11 13 15 17
24 - 15 = 9, Odd integer = 15 17 19 21 23

Therefore, we can say that there is 5 odd numbers between m & n. Sufficient.

(2) m is a positive integer. No info about n. Insufficient.

Answer : A
The answer is C.
Your case will only be true when both m and n are integers..but that has not been stated in the question. Try 2.3 and 11.3 --> 3,5,7,9,11. And the integers have to be between the values excluding the ends. Bunuel please confirm.
Show more

Yes, we need to know that m and n are integers.
avatar
coolkl
avatar
Joined: 10 Jun 2016
Last visit: 06 Feb 2019
Posts: 31
Own Kudos:
12
Given Kudos: 194
Schools: IIM-A"19
Schools: IIM-A"19
Posts: 31
Kudos: 12
How many odd numbers are there between m and n? 16 Mar 2017, 17:23
Kudos
Add Kudos
Bookmarks
Bookmark this Post
S-1) If m and n integers then always 4 Ex m = 11 and n = 2
So 11-2 = 9. Numbers are 2,3,4,5,6,7,8,9. 4 odd.

if m = 11.5 and n = 2.5 then odd numbers are 5. Not sufficient

S-2) NS as not much info

S-T) Yes now we know m is integer so n has to be integer. Sufficient"

Answer is C.
User avatar
ShashankDave
User avatar
Joined: 03 Apr 2013
Last visit: 26 Jan 2020
Posts: 215
Own Kudos:
303
Given Kudos: 872
Location: India
Concentration: Marketing, Finance
Schools: McDonough '21 (A) Kelley '21 ISB '21 (I)
GMAT 1: 740 Q50 V41
GPA: 3
Schools: McDonough '21 (A) Kelley '21 ISB '21 (I)
GMAT 1: 740 Q50 V41
Posts: 215
Kudos: 303
How many odd numbers are there between m and n? 17 Mar 2017, 01:26
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hi Bunuel

Please also confirm whether it is going to be explicitly stated on the GMAT that "m and n are real numbers". Is this something that is stated? or its like this question where nothing is written explicitly?
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 28 Apr 2026
Posts: 109,950
Own Kudos:
811,763
Given Kudos: 105,927
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,950
Kudos: 811,763
How many odd numbers are there between m and n? 17 Mar 2017, 01:58
Kudos
Add Kudos
Bookmarks
Bookmark this Post
ShashankDave
Hi Bunuel

Please also confirm whether it is going to be explicitly stated on the GMAT that "m and n are real numbers". Is this something that is stated? or its like this question where nothing is written explicitly?
Show more

I answered your question here: https://gmatclub.com/forum/is-x-2-9-pri ... l#p1818186

By default on the GMAT all numbers are real. So, NO, it won't be mentioned because by default all numbers on the GMAT are real numbers.
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,986
Own Kudos:
1,119
Posts: 38,986
Kudos: 1,119
How many odd numbers are there between m and n? 24 Sep 2023, 06:28
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderators:
Bunuel
Math Expert
109950 posts
kingbucky
498 posts
Gmat860sanskar
212 posts