Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 20 Jun 2013, 03:57
Customize  |  Hide

Search
Register
New posts
Unanswered

If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
1 KUDOS received
Manager
Manager
Joined: 25 Dec 2011
Posts: 54
GMAT Date: 05-31-2012
Followers: 0

Kudos [?]: 9 [1] , given: 29

GMAT Tests User
If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1 [#permalink] New post 19 Feb 2012, 09:49
1
This post received
KUDOS
00:00

Question Stats:

60% (02:13) correct 39% (00:48) wrong based on 33 sessions
If S is the infinite sequence: S1=9, S2=99, S3=999, ..., SK = 10^K-1, ..., is every term in S divisible by the prime number p?

(1) p is greater than 2.

(2) At least one term in sequence S is divisible by p.

I think with statement 2 - if P is 3 then all the terms in the sequence are divisible by P
So my answer is B

Please advise.
[Reveal] Spoiler: OA
1 KUDOS received
GMAT Club team member
User avatar
Joined: 02 Sep 2009
Posts: 12122
Followers: 1879

Kudos [?]: 10138 [1] , given: 968

GMAT Tests User CAT Tests
Top Member of the Month
Re: If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1 [#permalink] New post 19 Feb 2012, 10:50
1
This post received
KUDOS
morya003 wrote:
If S is the infinite sequence: S1=9, S2=99, S3=999, ..., SK = 10^K-1, ..., is every term in S divisible by the prime number p?

(1) p is greater than 2.

(2) At least one term in sequence S is divisible by p.


No, B is not correct. It's straight E: if p=3 then every term in S is divisible by p but if p=11 then some terms in S are divisible by p (for example 99 and 9999) and some are not (for example 9 and 999). Not sufficient.

Answer: E.

hope it's clear.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!! ,11 Mixed Questions NEW!!!, 12 Fresh Meat NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!, 11 New DS set. NEW!!!


What are GMAT Club Tests?
25 extra-hard Quant Tests

Find out what's new at GMAT Club - latest features and updates

Senior Manager
Senior Manager
User avatar
Status: May The Force Be With Me (D-DAY 15 May 2012)
Joined: 06 Jan 2012
Posts: 295
Location: India
Concentration: General Management, Entrepreneurship
Schools: Ross '15 (D), Tuck '15 (D), Duke '15 (D), INSEAD Jan '13 (D), ISB '14 (D), Ivey '15, NUS '15 (D), NTU '15 (WL)
Followers: 1

Kudos [?]: 40 [0], given: 16

Reviews Badge
Re: If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1 [#permalink] New post 21 Feb 2012, 03:24
+1 E

Question tends to make you just go for 3 & you choose C but as Bunuel pointed out if you use 11 the assumption fails
_________________

Giving +1 kudos is a better way of saying 'Thank You'.

Senior Manager
Senior Manager
Joined: 29 Nov 2012
Posts: 395
Followers: 1

Kudos [?]: 18 [0], given: 314

Re: If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1 [#permalink] New post 22 Jan 2013, 05:43
what would be the equations for each statement?
GMAT Club team member
User avatar
Joined: 02 Sep 2009
Posts: 12122
Followers: 1879

Kudos [?]: 10138 [0], given: 968

GMAT Tests User CAT Tests
Top Member of the Month
Re: If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1 [#permalink] New post 22 Jan 2013, 06:23
fozzzy wrote:
what would be the equations for each statement?


What equations are you talking about?
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!! ,11 Mixed Questions NEW!!!, 12 Fresh Meat NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!, 11 New DS set. NEW!!!


What are GMAT Club Tests?
25 extra-hard Quant Tests

Find out what's new at GMAT Club - latest features and updates

Senior Manager
Senior Manager
Joined: 29 Nov 2012
Posts: 395
Followers: 1

Kudos [?]: 18 [0], given: 314

Re: If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1 [#permalink] New post 22 Jan 2013, 08:20
If you were to test examples to satisfy the equations what would they be examples for each statement.
GMAT Club team member
User avatar
Joined: 02 Sep 2009
Posts: 12122
Followers: 1879

Kudos [?]: 10138 [0], given: 968

GMAT Tests User CAT Tests
Top Member of the Month
Re: If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1 [#permalink] New post 22 Jan 2013, 08:24
fozzzy wrote:
If you were to test examples to satisfy the equations what would they be examples for each statement.


Since the answer is E, then the examples given in my post to show that the two statements taken together are not sufficient to answer the question, would also serve to discard each statement.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!! ,11 Mixed Questions NEW!!!, 12 Fresh Meat NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!, 11 New DS set. NEW!!!


What are GMAT Club Tests?
25 extra-hard Quant Tests

Find out what's new at GMAT Club - latest features and updates

Re: If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1   [#permalink] 22 Jan 2013, 08:24
    Similar topics Author Replies Last post
Similar
Topics:
 New posts In a certain infinite sequence AJB77 3 02 Jul 2005, 22:56
New posts Infinite Sequence The infinite sequence a1, a2, , an, is rbcola 7 21 Jun 2006, 17:12
New posts If S is an infinite sequence of positive integers, is S an GMATT73 1 04 Sep 2006, 08:15
New posts 1 Experts publish their posts in the topic Infinite sequence ITC 3 21 Apr 2010, 06:49
New posts 6 Experts publish their posts in the topic S is an infinite sequence, in which the value of a gmatprep2011 6 23 Sep 2011, 23:23
Display posts from previous: Sort by

If S is the infinite sequence S1=9 S2=99 S3=999 SK=10^k-1

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: VeritasPrepKarishma, Bunuel, IanStewart

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com