GRE Prep 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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
GRE Math Challenge #18- 4 mathematics and 5 physics books
[#permalink]
09 Sep 2014, 03:11
09 Sep 2014, 03:11
Expert Reply
00:00
Question Stats:
66% (02:30) correct
33% (00:35) wrong based on 3 sessions
Hide Show timer Statistics
4 mathematics and 5 physics books are arranged in a row on a shelf at random. Find the probability that the books on the same subject will be put together.
Show: :: Answer
total no. of ways of arranging all 9 books= 9! =A
total no. of arranging books such that all books of one kind are together
= 4! * 5! * 2 = B
thus probability that all books of one kind are together = B/A
total no. of arranging books such that all books of one kind are together
= 4! * 5! * 2 = B
thus probability that all books of one kind are together = B/A
gmatclubot
GRE Math Challenge #18- 4 mathematics and 5 physics books [#permalink]
09 Sep 2014, 03:11
Moderators:
|
|
||
