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.
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
In his pocket, a boy has 3 red marbles, 4 blue marbles, and
[#permalink]
Show Tags
Updated on: 02 Nov 2012, 14:11
9
00:00
A
B
C
D
E
Difficulty:
15% (low)
Question Stats:
72% (00:45) correct 28% (00:44) wrong based on 427 sessions
HideShow timer Statistics
In his pocket, a boy has 3 red marbles, 4 blue marbles, and 4 green marbles. How many will he have to take out of his pocket to ensure that he has taken out at least one of each color?
24. In his pocket, a boy has 3 red marbles, 4 blue marbles, and 4 green marbles. How many will he have to take out of his pocket to ensure that he has taken out at least one of each color?
A. 3 B. 7 C. 8 D. 9 E. 11
The worst scenario would be that he has taken 4 blue and 4 green, total of 8 marbles, and still doesn't have 3 distinct colors. But the next draw (9th) will surely be the third color red as there is no other color marble left in pocket.
What about scenario of choosing 3 red and 4 blue and still seeing distinct color. In other words why can't we have 8 marbles drawn and still see three distinct colors? 3red+4 blue=7 marbles and on 8th draw should be green since remaining should be all green marbles?
What about scenario of choosing 3 red and 4 blue and still seeing distinct color. In other words why can't we have 8 marbles drawn and still see three distinct colors? 3red+4 blue=7 marbles and on 8th draw should be green since remaining should be all green marbles?
Can someone please explain why?
Thanks in advance.
The word "ensure" in the question basically is asking in the worst case scenario. So yes technically, the scenario outlined above is true as well, it is not the worst possible outcome.
In order to guarantee the outcome of one of each color, you need to take into account all of the balls in the two largest groups which equals 8.
Re: In his pocket, a boy has 3 red marbles, 4 blue marbles, and
[#permalink]
Show Tags
26 Sep 2013, 05:01
What is the difference between this question and the one below.Please explain its confusing:
There are 15 black chips and 5 white chips in a jar. What is the least number of chips we should pick to guarantee that we have 2 chips of the same color? A. 3 B. 5 C. 6 D. 16 E. 19
Worst case scenario would be if the first two chips we pick will be of the different colors. But the next chip must match with either of two, so 3 is the answer.
Re: In his pocket, a boy has 3 red marbles, 4 blue marbles, and
[#permalink]
Show Tags
12 Jul 2018, 20:57
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.
_________________
close
72% (00:45) correct 
