It is currently 20 Sep 2017, 22:18

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Sequence

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 16 Apr 2009
Posts: 233

Kudos [?]: 99 [0], given: 10

Schools: Ross
Sequence [#permalink]

Show Tags

New post 03 Jun 2009, 18:42
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A sequence, a1=64, a2=66, a3=67, an=8+an-3, which of the following is in the sequence?

105
786
966
1025
_________________

Keep trying no matter how hard it seems, it will get easier.

Kudos [?]: 99 [0], given: 10

1 KUDOS received
SVP
SVP
User avatar
Joined: 29 Aug 2007
Posts: 2473

Kudos [?]: 832 [1], given: 19

Re: Sequence [#permalink]

Show Tags

New post 03 Jun 2009, 19:13
1
This post received
KUDOS
vannu wrote:
A sequence, a1=64, a2=66, a3=67, an=8+an-3, which of the following is in the sequence?

105
786
966
1025


Thats a good question but AC (answer choice) E is missing. :shock:

a1 = 64
a2 = 66
a3 = 67

an = 8 + a(n-3)
a3 = 8 + a0
a0 = 67-8 = 59

a4 = a1 + 8 = 64 + 8 = 72
a5 = a2 + 8 = 66 + 8 = 74
a6 = a3 + 8 = 67 + 8 = 75

A. (105 - 64)/8 = k where k must be an integer but k is not.
(105 - 66)/8 = m where m must be an integer but m is not.
(105 - 67)/8 = n where n must be an integer but n is not.
So A is not

B. (786 - 64)/8 = x where x must be an integer but x is not.
(786 - 66)/8 = 720/8 = 90 = y where y must be an integer and y is an integer. Bingo....
(786 - 67)/8 = z where z must be an integer but z is not.
B is.

C. (966 - 64)/8 = p where p must be an integer but p is not.
(966 - 66)/8 = q where q must be an integer but q is not.
(966 - 67)/8 = r where r must be an integer but r is not.

C is not.
D. (1025 - 64)/8 = a where a must be an integer but a is not.
(1025 - 66)/8 = b where b must be an integer but b is not.
(1025 - 67)/8 = c where c must be an integer but c is not.

D is not.


Therefore it is B.
_________________

Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html
Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html
Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html


GT

Kudos [?]: 832 [1], given: 19

Senior Manager
Senior Manager
User avatar
Joined: 15 Jan 2008
Posts: 281

Kudos [?]: 47 [0], given: 3

Re: Sequence [#permalink]

Show Tags

New post 04 Jun 2009, 01:58
MY logic of approach..

All the numbers in this sequence will remainder 0,2,3 when divided by 8.

So if the remainder is one of the above, its in the sequence..

B gives teh remaider 2.. and hence in the sequence.

Kudos [?]: 47 [0], given: 3

Intern
Intern
avatar
Joined: 12 May 2009
Posts: 47

Kudos [?]: 3 [0], given: 1

Location: Mumbai
Re: Sequence [#permalink]

Show Tags

New post 04 Jun 2009, 05:00
IMO B

I took 8 as base and i got the 0, 2, 3 as reminder.
Dividing the numbers i got only 786 as match which had reminder 2.

Kudos [?]: 3 [0], given: 1

Senior Manager
Senior Manager
User avatar
Joined: 16 Jan 2009
Posts: 360

Kudos [?]: 226 [0], given: 16

Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Re: Sequence [#permalink]

Show Tags

New post 04 Jun 2009, 12:37
IMO B.

we can devide each option by 8 to find from which (a1 / a2 / a3) it as been derived.
The range of remainders is 0 / 2 /3
786 has reminder 2.
_________________

Lahoosaher

Kudos [?]: 226 [0], given: 16

Re: Sequence   [#permalink] 04 Jun 2009, 12:37
Display posts from previous: Sort by

Sequence

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.