It is currently 18 Dec 2018, 15:34
My Tests

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.

A number, x, is randomly selected from the integers from 42

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Moderator
Moderator
User avatar
Joined: 18 Apr 2015
Posts: 5204
Followers: 77

Kudos [?]: 1051 [0], given: 4710

CAT Tests
A number, x, is randomly selected from the integers from 42 [#permalink] New post 01 Dec 2018, 10:50
Expert's post
00:00

Question Stats:

100% (00:44) correct 0% (00:00) wrong based on 9 sessions
A number, x, is randomly selected from the integers from 42 to 92 inclusive.

Quantity A
Quantity B
The probability that x is odd.
The probability that x is even.


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given
[Reveal] Spoiler: OA

_________________

Get the 2 FREE GREPrepclub Tests

1 KUDOS received
GRE Instructor
User avatar
Joined: 10 Apr 2015
Posts: 1253
Followers: 47

Kudos [?]: 1159 [1] , given: 7

Re: A number, x, is randomly selected from the integers from 42 [#permalink] New post 01 Dec 2018, 14:19
1
This post received
KUDOS
Expert's post
Carcass wrote:
A number, x, is randomly selected from the integers from 42 to 92 inclusive.

Quantity A
Quantity B
The probability that x is odd.
The probability that x is even.


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given


----ASIDE---------------------
Since even and odd integers alternate, one might incorrectly assume that each probability = 1/2.
However, if there's an odd number of integers in the group (like 4, 5, 6, 7, 8), the number of even integers is one more than the number of odd integers.
----------------------------------

A nice rule says: the number of integers from x to y inclusive equals y - x + 1
So, the number of integers from 42 to 92 inclusive = 92 - 42 + 1 = 51

Since our integers start and end with an EVEN integer (42 and 92) there must be 26 EVEN integers and 25 ODD integers.

So P(x is EVEN) = 26/51
and P(x is ODD) = 25/51

We get:
QUANTITY A: 25/51
QUANTITY B: 26/51

Answer: B

Cheers,
Brent
_________________

Brent Hanneson – Creator of greenlighttestprep.com
Image
Sign up for our free GRE Question of the Day emails

Re: A number, x, is randomly selected from the integers from 42   [#permalink] 01 Dec 2018, 14:19
Display posts from previous: Sort by

A number, x, is randomly selected from the integers from 42

  Question banks Downloads My Bookmarks Reviews Important topics  


GRE Prep Club Forum Home| About| Terms and Conditions and Privacy Policy| GRE Prep Club Rules| Contact

Powered by phpBB © phpBB Group

Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.