Find all School-related info fast with the new School-Specific MBA Forum

It is currently 23 Jul 2014, 12:31

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

How many 3-digit numerals ?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
User avatar
Joined: 29 Jun 2010
Posts: 251
Schools: LBS, Oxford
Followers: 8

Kudos [?]: 20 [0], given: 12

GMAT Tests User
How many 3-digit numerals ? [#permalink] New post 10 Jul 2011, 19:40
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

75% (01:26) correct 25% (00:00) wrong based on 4 sessions
How many 3-digit numerals begin with a digit that represents a prime and end with a digit that represents a prime number?

A) 16
B) 80
c) 160
D) 180
E) 240
[Reveal] Spoiler: OA
Manager
Manager
avatar
Joined: 24 Nov 2010
Posts: 212
Location: United States (CA)
Concentration: Technology, Entrepreneurship
Schools: Ross '15, Duke '15
Followers: 2

Kudos [?]: 32 [0], given: 7

GMAT ToolKit User GMAT Tests User
Re: How many 3-digit numerals ? [#permalink] New post 10 Jul 2011, 20:07
prime digits - 2, 3, 5, 7

there will 10 number starting with 2 and ending in 2 like 202, 212, 222, 232..
similarly 10 numbers starting with 2 and ending in 3, 10 ending in 5, and 10 ending in 7
so total numbers starting with 2 = 40
similarly 40 starting with 3, 5, and 7
so total = 40*4 = 160
Senior Manager
Senior Manager
User avatar
Joined: 03 Mar 2010
Posts: 447
Schools: Kelley,Tepper,Carlson,Kenan Flager,Broad
Followers: 4

Kudos [?]: 103 [0], given: 22

GMAT Tests User
Re: How many 3-digit numerals ? [#permalink] New post 10 Jul 2011, 23:04
prime digits 2,3,5 and 7.
three digit numbers _ _ _
1st place can be filled in 4 ways
2nd place can be filled in 10 ways
3rd place can be filled in 4 ways
Total=4*10*4=160

_________________

My dad once said to me: Son, nothing succeeds like success.

Re: How many 3-digit numerals ?   [#permalink] 10 Jul 2011, 23:04
    Similar topics Author Replies Last post
Similar
Topics:
Combinations - how many 3 digit numbers? Forrester300 4 03 Mar 2009, 16:33
How many 3- digit numbers between 100 and 200 have a digit Seyi 5 11 Nov 2004, 07:54
79 Experts publish their posts in the topic How many even 3 digit integers greater than 700 with twixt 34 02 Sep 2004, 14:21
How many different 3 digit possible integers can be formed lastochka 4 22 Aug 2004, 19:08
Display posts from previous: Sort by

How many 3-digit numerals ?

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.