Last visit was: 23 Apr 2026, 10:51 It is currently 23 Apr 2026, 10:51
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
User avatar
misterJJ2u
User avatar
Joined: 29 Nov 2006
Last visit: 01 Oct 2009
Posts: 170
Own Kudos:
1,261
Location: Orange County, CA
Posts: 170
Kudos: 1,261
From a list of 1-8, how many ways can you pick 3 numbers so 20 Aug 2007, 13:25
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

History

Date
Time
Result
Not Attempted Yet
From a list of 1-8, how many ways can you pick 3 numbers so that the sum of the numbers is 12?



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
Sumithra Sen
User avatar
Joined: 18 Jun 2007
Last visit: 29 Aug 2007
Posts: 47
Own Kudos:
9
Posts: 47
Kudos: 9
From a list of 1-8, how many ways can you pick 3 numbers so 20 Aug 2007, 13:33
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Not sure if I am totally off..

I just tried using combinations.. since 1 + 3 + 5 , is the same as 3 + 1 + 5 or any other combo..I left the repetitions out.

I come up 11 as the answer? is this correct?
User avatar
dahcrap
User avatar
Joined: 03 Jun 2007
Last visit: 27 May 2008
Posts: 159
Own Kudos:
33
Posts: 159
Kudos: 33
From a list of 1-8, how many ways can you pick 3 numbers so 20 Aug 2007, 13:37
Kudos
Add Kudos
Bookmarks
Bookmark this Post
44 ? I dont have a shortcut to do this. Can someone suggest a shorter method. This problem took abt 4 mins. Or Am I not thinking ?
User avatar
bkk145
User avatar
Joined: 10 Jun 2007
Last visit: 23 Feb 2014
Posts: 645
Own Kudos:
1,801
Posts: 645
Kudos: 1,801
From a list of 1-8, how many ways can you pick 3 numbers so 20 Aug 2007, 17:17
Kudos
Add Kudos
Bookmarks
Bookmark this Post
misterJJ2u
From a list of 1-8, how many ways can you pick 3 numbers so that the sum of the numbers is 12?
Show more


I don't know if this is right, but here we go....

Start off with 2 numbers and eliminate the same number combinations.

12 = 8+4 => Look at how many two numbers can make up 4, you have: (1+3) only. Look at how many numbers can make up 8, you have (1+7), (2+6), (3+5). So total of 4 combinations here.

12 = 7+5 => Same way:
For 5, (1+4), (2+3)
For 7, (6+1), (5+2), (4+3)
Can't use (5+2) here cuz it is the same number. Total of 4.

12 = 6+6 => Same way:
For 6, (1+5), (2+4)
Total of 2.

Total combinations = 4+4+2 = 10
User avatar
Sumithra Sen
User avatar
Joined: 18 Jun 2007
Last visit: 29 Aug 2007
Posts: 47
Own Kudos:
9
Posts: 47
Kudos: 9
From a list of 1-8, how many ways can you pick 3 numbers so 20 Aug 2007, 17:53
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bkk145- I used the same method and came up with 11.. wonder what the correct answer is.
User avatar
Whatever
User avatar
Joined: 03 Sep 2006
Last visit: 17 Jun 2008
Posts: 95
Own Kudos:
96
Posts: 95
Kudos: 96
From a list of 1-8, how many ways can you pick 3 numbers so 20 Aug 2007, 20:21
Kudos
Add Kudos
Bookmarks
Bookmark this Post
My 5 cents:

1) 12 = 8 + 3 + 1 --> 6 combinations ('cause it could be 8 + 1 + 3 and so on)
2) 12 = 7 + 4 + 1 --> 6 combinations (ALREADY answer is definitely >10 or 11)

SO
1) (** + **) + 1 = 12.
** + ** should = 11, and we have 10 combinations for this.
2) (** + **) + 2 = 12
** + ** should = 10, and we have 9 combinations for this.
... and so on

I would look into the unswer choices and use POI - it'll be faster
User avatar
BCC145
User avatar
Joined: 14 May 2006
Last visit: 27 Apr 2009
Posts: 165
Own Kudos:
16
Posts: 165
Kudos: 16
From a list of 1-8, how many ways can you pick 3 numbers so 21 Aug 2007, 02:17
Kudos
Add Kudos
Bookmarks
Bookmark this Post
misterJJ2u
From a list of 1-8, how many ways can you pick 3 numbers so that the sum of the numbers is 12?
Show more


Having answer choices might help.

x + y + z = 12

x=1 then y+z = 11. So 3 combinations here.
x=2 then y+z = 10. So 2 combinations here.
x=3 then y+z = 9. So 3 combinations here. (exclude 6+3)
x=4 then y+z = 8. So 3 combinations here.
x=5 then y+z = 7. So 2 combinations here. (exclude 5+2)
x=6 then y+z = 6. So 2 combinations here.
x=7 then y+z = 5. So 2 combinations here.
x=8 then y+z = 4. So 1 combination here.

So total combinations = 18.

I see no patterns in this problem.
User avatar
GMATBLACKBELT
User avatar
Joined: 29 Mar 2007
Last visit: 03 Jun 2013
Posts: 1,138
Own Kudos:
1,912
Posts: 1,138
Kudos: 1,912
From a list of 1-8, how many ways can you pick 3 numbers so 21 Aug 2007, 11:49
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Whatever
My 5 cents:

1) 12 = 8 + 3 + 1 --> 6 combinations ('cause it could be 8 + 1 + 3 and so on)
2) 12 = 7 + 4 + 1 --> 6 combinations (ALREADY answer is definitely >10 or 11)

SO
1) (** + **) + 1 = 12.
** + ** should = 11, and we have 10 combinations for this.
2) (** + **) + 2 = 12
** + ** should = 10, and we have 9 combinations for this.
... and so on


I would look into the unswer choices and use POI - it'll be faster
Show more


I did the same thing as you. Seriously we need some answer choices.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
Moderator:
Bunuel
Math Expert
109782 posts