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

 It is currently 07 Jul 2015, 10:42

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# For a certain sequence, A(1)= -1, A(2)=1. When n>=3,

Author Message
TAGS:
Director
Joined: 14 Sep 2005
Posts: 993
Location: South Korea
Followers: 2

Kudos [?]: 50 [0], given: 0

For a certain sequence, A(1)= -1, A(2)=1. When n>=3, [#permalink]  11 Dec 2005, 05:35
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
For a certain sequence, A(1)= -1, A(2)=1. When n>=3, A(n)=A(n-1)-A(n-2), what is the sum of the first 1000 items?
_________________

Auge um Auge, Zahn um Zahn !

Director
Joined: 13 Nov 2003
Posts: 790
Location: BULGARIA
Followers: 1

Kudos [?]: 30 [0], given: 0

A1=-1, A2=1,A3=2, A4=1, A5=-1,A6=-2,A7=-1,A8=1,A9=2,A10=1 so seems like 300
Manager
Joined: 20 Nov 2005
Posts: 55
Location: Indianapolis, IN
Followers: 1

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

christoph wrote:
2 !

I am getting 0...
VP
Joined: 30 Sep 2004
Posts: 1488
Location: Germany
Followers: 4

Kudos [?]: 105 [0], given: 0

christoph wrote:
2 !

I am getting 0...

sequence is -1121-1-2, which adds to 0 ! sum of 1st to 996th-item is 0. 997th item is -1, etc..so its not 2 but 3 !
_________________

If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

Similar topics Replies Last post
Similar
Topics:
1 The sequence a(1), a(2), ..., a(n), ... is such that 4 02 Mar 2012, 20:12
The sequence a1, a2, , a n, is such that an = 2an-1 - x 3 27 Sep 2008, 11:52
The infinite sequence a(1), a(2),, a(n), is such that a(1) = 5 10 Dec 2007, 15:08
5 The sequence a1, a2, … , a n, … is such that an = 2an-1 - x 11 04 Jun 2007, 19:23
The sequence a1, a2, , a n, is such that an = 2an-1 - x 2 12 Nov 2006, 08:48
Display posts from previous: Sort by