Every morning, Casey walks from her house to the bus stop : GMAT Problem Solving (PS)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 24 Jan 2017, 00:26

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Every morning, Casey walks from her house to the bus stop

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

Hide Tags

Manager
Status: Still Struggling
Joined: 02 Nov 2010
Posts: 138
Location: India
GMAT Date: 10-15-2011
GPA: 3.71
WE: Information Technology (Computer Software)
Followers: 5

Kudos [?]: 82 [2] , given: 8

Every morning, Casey walks from her house to the bus stop [#permalink]

Show Tags

04 Nov 2010, 06:05
2
This post received
KUDOS
9
This post was
BOOKMARKED
00:00

Difficulty:

(N/A)

Question Stats:

87% (02:05) correct 13% (01:04) wrong based on 40 sessions

HideShow timer Statistics

Encountered another question and dont know how to proceed:

Every morning, Casey walks from her house to the bus stop. She always travels exactly nine blocks from her house to the bus, but she varies the route she takes every day. (One sample route is shown). How many days can Casey walk from her house to the bus stop without repeating the same route?
Attachments

route.jpg [ 9.16 KiB | Viewed 10162 times ]

_________________

Appreciation in KUDOS please!
Knewton Free Test 10/03 - 710 (49/37)
Princeton Free Test 10/08 - 610 (44/31)
Kaplan Test 1- 10/10 - 630
Veritas Prep- 10/11 - 630 (42/37)
MGMAT 1 - 10/12 - 680 (45/34)

Math Expert
Joined: 02 Sep 2009
Posts: 36622
Followers: 7103

Kudos [?]: 93601 [13] , given: 10582

Re: A nickel, a dime, and 2 quarters [#permalink]

Show Tags

04 Nov 2010, 06:35
13
This post received
KUDOS
Expert's post
6
This post was
BOOKMARKED
krishnasty wrote:
Encountered another question and dont know how to proceed:

Every morning, Casey walks from her house to the bus stop. She always travels exactly nine blocks from her house to the bus, but she varies the route she takes every day. (One sample route is shown). How many days can Casey walk from her house to the bus stop without repeating the same route?

In order to travel exactly nine blocks Casey should go 5 block down and 4 block left - DDDDDLLLL.

# of permutations of 9 letters DDDDDLLLL out of which there are 5 identical D's and 4 identical L's is $$\frac{9!}{5!4!}$$.

Hope it's clear.
_________________
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 13534
Followers: 577

Kudos [?]: 163 [0], given: 0

Re: Every morning, Casey walks from her house to the bus stop [#permalink]

Show Tags

24 Sep 2013, 21:43
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Math Expert
Joined: 02 Sep 2009
Posts: 36622
Followers: 7103

Kudos [?]: 93601 [0], given: 10582

Re: Every morning, Casey walks from her house to the bus stop [#permalink]

Show Tags

25 Sep 2013, 00:46
Expert's post
1
This post was
BOOKMARKED
krishnasty wrote:
Encountered another question and dont know how to proceed:

Every morning, Casey walks from her house to the bus stop. She always travels exactly nine blocks from her house to the bus, but she varies the route she takes every day. (One sample route is shown). How many days can Casey walk from her house to the bus stop without repeating the same route?

Similar questions to practice:
grockit-similar-to-og-quant-qustion-99962.html
pat-will-walk-from-intersection-a-to-intersection-b-along-a-68374.html
_________________
Intern
Joined: 07 Aug 2013
Posts: 30
Followers: 0

Kudos [?]: 5 [1] , given: 1

Re: Every morning, Casey walks from her house to the bus stop [#permalink]

Show Tags

25 Sep 2013, 06:23
1
This post received
KUDOS
The answer should be 126

9!/(4!*5!) or (9*8*7*6*5)/(4*3*2*1)
Current Student
Joined: 06 Sep 2013
Posts: 2035
Concentration: Finance
GMAT 1: 770 Q0 V
Followers: 62

Kudos [?]: 594 [0], given: 355

Re: Every morning, Casey walks from her house to the bus stop [#permalink]

Show Tags

25 May 2014, 10:34
Valerun wrote:
The answer should be 126

9!/(4!*5!) or (9*8*7*6*5)/(4*3*2*1)

Agree with 126 as answer

Namely 9C4 as also pointed out correctly by Quant Expert Bunuel

Answer: A

Cheers
J
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 13534
Followers: 577

Kudos [?]: 163 [0], given: 0

Re: Every morning, Casey walks from her house to the bus stop [#permalink]

Show Tags

30 Jun 2015, 05:16
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 13534
Followers: 577

Kudos [?]: 163 [0], given: 0

Re: Every morning, Casey walks from her house to the bus stop [#permalink]

Show Tags

07 Jul 2016, 23:17
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Manager
Joined: 18 Jun 2016
Posts: 105
Location: India
Concentration: Technology, Entrepreneurship
WE: Business Development (Computer Software)
Followers: 2

Kudos [?]: 12 [1] , given: 76

Re: Every morning, Casey walks from her house to the bus stop [#permalink]

Show Tags

07 Sep 2016, 15:29
1
This post received
KUDOS
Bunuel wrote:
krishnasty wrote:
Encountered another question and dont know how to proceed:

Every morning, Casey walks from her house to the bus stop. She always travels exactly nine blocks from her house to the bus, but she varies the route she takes every day. (One sample route is shown). How many days can Casey walk from her house to the bus stop without repeating the same route?

In order to travel exactly nine blocks Casey should go 5 block down and 4 block left - DDDDDLLLL.

# of permutations of 9 letters DDDDDLLLL out of which there are 5 identical D's and 4 identical L's is $$\frac{9!}{5!4!}$$.

Hope it's clear.

Why it cant be 6*5 (as in 6 lines to the left and 5 lines down?

or if we are choosing blocks than 5C1 * 4C1
_________________

If my post was helpful, feel free to give kudos!

Intern
Joined: 23 May 2016
Posts: 8
Schools: Foster '20
GMAT 1: 710 Q49 V38
GPA: 3.5
WE: Engineering (Energy and Utilities)
Followers: 1

Kudos [?]: 5 [0], given: 0

Re: Every morning, Casey walks from her house to the bus stop [#permalink]

Show Tags

21 Sep 2016, 08:36
sidoknowia wrote:
Bunuel wrote:
krishnasty wrote:
Encountered another question and dont know how to proceed:

Every morning, Casey walks from her house to the bus stop. She always travels exactly nine blocks from her house to the bus, but she varies the route she takes every day. (One sample route is shown). How many days can Casey walk from her house to the bus stop without repeating the same route?

In order to travel exactly nine blocks Casey should go 5 block down and 4 block left - DDDDDLLLL.

# of permutations of 9 letters DDDDDLLLL out of which there are 5 identical D's and 4 identical L's is $$\frac{9!}{5!4!}$$.

Hope it's clear.

Why it cant be 6*5 (as in 6 lines to the left and 5 lines down?

or if we are choosing blocks than 5C1 * 4C1

sidoknowia,

Think of it like this:

There are a total of 9 turns that have to be made, 5D and 4L. In order to make find out the number of possible routes you have to think about how many different combinations of D turns you can make if there are 9 possible positions. Thinking of it like this leaves you with 9C5 = 9!/5!(9-5)! =126.

Or you cant think of it as how many combinations of L turns you cam make if there are 9 possible positions. This leaves you with 9C4 = 9!/4!(9-4)! = 126. Same answer either way.
Re: Every morning, Casey walks from her house to the bus stop   [#permalink] 21 Sep 2016, 08:36
Similar topics Replies Last post
Similar
Topics:
1 Angelina walked 360 meters from her home to the grocery at a constant 1 15 Jan 2016, 15:13
8 A Man walked from his house to office at 5kmph and got 20 mi 9 24 Aug 2013, 21:06
8 Buses A and B start from a common bus stop X. Bus A begins 5 20 Aug 2013, 17:22
a bus every 4 and 12 mins 1 26 Aug 2011, 12:32
19 A bus stop is served by express buses, which run every hour 16 27 Jan 2008, 18:35
Display posts from previous: Sort by

Every morning, Casey walks from her house to the bus stop

 new topic 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®.