It is currently 17 Nov 2017, 10:09

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

A sequence of numbers is given by the rule an = (an – 1)^2. What is a5

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42250

Kudos [?]: 132491 [0], given: 12323

A sequence of numbers is given by the rule an = (an – 1)^2. What is a5 [#permalink]

Show Tags

New post 29 Oct 2017, 01:56
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

88% (00:43) correct 13% (00:38) wrong based on 24 sessions

HideShow timer Statistics

Kudos [?]: 132491 [0], given: 12323

Expert Post
Math Expert
User avatar
P
Joined: 02 Aug 2009
Posts: 5197

Kudos [?]: 5815 [0], given: 117

Re: A sequence of numbers is given by the rule an = (an – 1)^2. What is a5 [#permalink]

Show Tags

New post 29 Oct 2017, 04:36
Bunuel wrote:
A sequence of numbers is given by the rule \(a_n = (a_{n – 1})^2\). What is \(a_5\)?

(1) \(a_1 = –1\)
(2) \(a_3 = 1\)


\(a_n = (a_{n – 1})^2\) tells us that each term is linked to another term..
so knowing ANY number in the sequence can give us the value of ALL terms in the sequence ..

we are looking for \(a_5\), so knowing any other term will help us in knowing it...

Both statements give us one value of a term, so EACH statement is sufficient

D
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Kudos [?]: 5815 [0], given: 117

Intern
Intern
avatar
B
Joined: 15 Aug 2016
Posts: 35

Kudos [?]: 1 [0], given: 39

Re: A sequence of numbers is given by the rule an = (an – 1)^2. What is a5 [#permalink]

Show Tags

New post 29 Oct 2017, 10:57
Both Statements are sufficient.

If a1 is given we can calculate a2,a3,a4 and then a5.

If a3 is given, we can calculate a4 and then a5.

IMO:D

Kudos [?]: 1 [0], given: 39

Re: A sequence of numbers is given by the rule an = (an – 1)^2. What is a5   [#permalink] 29 Oct 2017, 10:57
Display posts from previous: Sort by

A sequence of numbers is given by the rule an = (an – 1)^2. What is a5

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.