It is currently 13 Dec 2017, 07:18

Decision(s) Day!:

CHAT Rooms | Ross R1 | Kellogg R1 | Darden R1 | Tepper R1


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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

The probability that a visitor at the mall buys a pack of

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

Hide Tags

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 14874

Kudos [?]: 287 [0], given: 0

Premium Member
Re: The probability that a visitor at the mall buys a pack of [#permalink]

Show Tags

New post 29 May 2017, 02:03
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 Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Kudos [?]: 287 [0], given: 0

Intern
Intern
avatar
B
Joined: 26 Jul 2014
Posts: 13

Kudos [?]: 1 [0], given: 29

GMAT ToolKit User
Re: The probability that a visitor at the mall buys a pack of [#permalink]

Show Tags

New post 30 Sep 2017, 05:38
Bunuel :
I still have some question over the 3rd problem:

1. "There are 6 cards numbered from 1 to 6" => so the case of (4,4) cannot happen. Am I right?

2. I solved this problem with the reasoning that:
- Probability of picking the 1st card: 2/4 (since there are 4 cards that can constitute to the sum of 8: 2, 6, 3, 5 and only 3,5 can be chose)
- Probability of picking 2nd card (after put the 1st card back): 1/4
So the probability of "one of the cards drawn was a 5, if the sum of the two cards was 8" is: 2/4 * 1/4 = 1/8

Can you clarify what is wrong with my solution?

Kudos [?]: 1 [0], given: 29

Expert Post
1 KUDOS received
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42582

Kudos [?]: 135493 [1], given: 12696

Re: The probability that a visitor at the mall buys a pack of [#permalink]

Show Tags

New post 30 Sep 2017, 05:43
1
This post received
KUDOS
Expert's post
ttdontcry wrote:
Bunuel :
I still have some question over the 3rd problem:

1. "There are 6 cards numbered from 1 to 6" => so the case of (4,4) cannot happen. Am I right?

2. I solved this problem with the reasoning that:
- Probability of picking the 1st card: 2/4 (since there are 4 cards that can constitute to the sum of 8: 2, 6, 3, 5 and only 3,5 can be chose)
- Probability of picking 2nd card (after put the 1st card back): 1/4
So the probability of "one of the cards drawn was a 5, if the sum of the two cards was 8" is: 2/4 * 1/4 = 1/8

Can you clarify what is wrong with my solution?


No, (4, 4) is possible because we are told that They are placed into a box, and then one is drawn and put back.
_________________

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 135493 [1], given: 12696

Re: The probability that a visitor at the mall buys a pack of   [#permalink] 30 Sep 2017, 05:43

Go to page   Previous    1   2   [ 23 posts ] 

Display posts from previous: Sort by

The probability that a visitor at the mall buys a pack of

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.