ps - sum + sum ? : PS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 16 Jan 2017, 14:12

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# ps - sum + sum ?

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
VP
Joined: 30 Sep 2004
Posts: 1488
Location: Germany
Followers: 6

Kudos [?]: 327 [0], given: 0

ps - sum + sum ? [#permalink]

### Show Tags

20 Oct 2005, 11:31
00:00

Difficulty:

(N/A)

Question Stats:

100% (02:30) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

...
Attachments

hardbin.JPG [ 21.27 KiB | Viewed 690 times ]

_________________

If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

Manager
Joined: 04 Oct 2005
Posts: 246
Followers: 1

Kudos [?]: 74 [0], given: 0

### Show Tags

20 Oct 2005, 12:00
BbBbBBBBBbBBbBbBBb.....

let q be sum of integers from 75 to 150
so p must simply be q + 151

1/q + 1/(q+151) ... rearrange and you get

2q + 151 / q^2 + q151
Current Student
Joined: 28 Dec 2004
Posts: 3384
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 15

Kudos [?]: 281 [0], given: 2

### Show Tags

20 Oct 2005, 12:00
LCM is q^2-151q

then q-151 goes into LCM q-151 times, and q goes q+151

so you have (q-151+q+151)/(q^2-151q)=2q/(q^2-151q)
Manager
Joined: 04 Oct 2005
Posts: 246
Followers: 1

Kudos [?]: 74 [0], given: 0

### Show Tags

20 Oct 2005, 12:08
hehe I did this one again and now get a different result... letting q be the sum of integers..... I let p be q-151...

but then I get A....:S
Senior Manager
Joined: 05 Aug 2005
Posts: 412
Followers: 2

Kudos [?]: 56 [0], given: 0

### Show Tags

20 Oct 2005, 18:54
Good one....

Q= p+151 so p=q-151

now solve 1/q-151 + 1/q ..... you will get A
SVP
Joined: 05 Apr 2005
Posts: 1731
Followers: 5

Kudos [?]: 74 [0], given: 0

### Show Tags

20 Oct 2005, 19:21
A.

p= sum (75+76+77+............+150)
q= sum (75+76+77+............150+151)
q= sum (75+76+77+............150) +151
q= p+151
p= q-151

given that: 1/p+1/q = ?
= (p+q)/(pq)
replace p with q-151
= (q-151+q)/(q)(q-151)
= (2q-151)/(q^2- 151q)

christoph always has good questions.
a truck of thanxxxxxx
VP
Joined: 13 Jun 2004
Posts: 1118
Location: London, UK
Schools: Tuck'08
Followers: 7

Kudos [?]: 45 [0], given: 0

### Show Tags

20 Oct 2005, 20:18
A too

just consider p=q-151 and plug
SVP
Joined: 03 Jan 2005
Posts: 2243
Followers: 16

Kudos [?]: 324 [0], given: 0

### Show Tags

20 Oct 2005, 21:11
nero44 wrote:
hehe I did this one again and now get a different result... letting q be the sum of integers..... I let p be q-151...

but then I get A....:S

You just have to make sure you are clear which is the bigger one ...
_________________

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.

20 Oct 2005, 21:11
Display posts from previous: Sort by

# ps - sum + sum ?

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.