Last visit was: 18 Sep 2024, 08:55 It is currently 18 Sep 2024, 08:55
Toolkit
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.
Request Expert Reply

# In a certain bookcase, 10 books are about science, 8 are about literat

SORT BY:
Tags:
Show Tags
Hide Tags
Math Expert
Joined: 02 Sep 2009
Posts: 95611
Own Kudos [?]: 659934 [1]
Given Kudos: 87311
GMAT Club Legend
Joined: 08 Jul 2010
Status:GMAT/GRE Tutor l Admission Consultant l On-Demand Course creator
Posts: 6064
Own Kudos [?]: 14153 [0]
Given Kudos: 125
Location: India
GMAT: QUANT+DI EXPERT
Schools: IIM (A) ISB '24
GMAT 1: 750 Q51 V41
WE:Education (Education)
GMAT Club Legend
Joined: 18 Aug 2017
Status:You learn more from failure than from success.
Posts: 8066
Own Kudos [?]: 4332 [0]
Given Kudos: 243
Location: India
Concentration: Sustainability, Marketing
GMAT Focus 1:
545 Q79 V79 DI73
GPA: 4
WE:Marketing (Energy and Utilities)
SVP
Joined: 27 May 2012
Posts: 1722
Own Kudos [?]: 1558 [0]
Given Kudos: 641
Re: In a certain bookcase, 10 books are about science, 8 are about literat [#permalink]
Bunuel
In a certain bookcase, 10 books are about science, 8 are about literature, 5 are about history, and 2 are about psychology. If a book is selected at random, what is the probability that the book is about science or history?

A 0.08
B 0.2
C 0.3
D 0.4
E 0.6

A or B = A+B
So science or History 10+5

So probability:
10/25 + 5/25 = 15/25 = 3/5 = 0.6
E

P.S.- Please can we tag this question as Probability rather than Combinations
Re: In a certain bookcase, 10 books are about science, 8 are about literat [#permalink]
Moderator:
Math Expert
95611 posts