It is currently 11 Dec 2017, 02:41

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

The nth term (tn) of a certain sequence is defined as tn = t

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

Hide Tags

Senior Manager
Status: Do and Die!!
Joined: 15 Sep 2010
Posts: 311

Kudos [?]: 606 [0], given: 193

The nth term (tn) of a certain sequence is defined as tn = t [#permalink]

Show Tags

24 Nov 2010, 10:50
00:00

Difficulty:

(N/A)

Question Stats:

86% (01:13) correct 14% (00:11) wrong based on 8 sessions

HideShow timer Statistics

The nth term (tn) of a certain sequence is defined as tn = tn-1 + 4. If t1= -7 then t71 =

OA
[Reveal] Spoiler:
273

_________________

I'm the Dumbest of All !!

Kudos [?]: 606 [0], given: 193

Math Expert
Joined: 02 Sep 2009
Posts: 42536

Kudos [?]: 135189 [0], given: 12671

Re: nth term of sequence [#permalink]

Show Tags

24 Nov 2010, 10:59
Expert's post
2
This post was
BOOKMARKED
shrive555 wrote:
The nth term (tn) of a certain sequence is defined as
tn = tn-1 + 4. If t1= -7 then t71 =

OA=273

Please post the whole question with answer choices.

Given: $$t_n=1_{n-1}+4$$.

Then: $$t_2=t_1+4$$, $$t_3=t_2+4=t_1+2*4$$, $$t_4=t_3+4=t_1+3*4$$... --> $$t_n=t_1+(n-1)*4$$.

So, $$t_{71}=t_1+70*4=-7+280=273$$.
_________________

Kudos [?]: 135189 [0], given: 12671

Manager
Joined: 13 Oct 2009
Posts: 54

Kudos [?]: 90 [0], given: 2

Location: New York, NY
Schools: Columbia, Johnson, Tuck, Stern
Re: nth term of sequence [#permalink]

Show Tags

24 Nov 2010, 19:51
Here is another way:

Given: T1 = Tn-1 +4 & T1 = -7

Then solve to get the
Direct Formula:
Tn = k*n+x k is the constant change which is 4 in this problem, find x

T1 = k + x
T1: -7 = 4 + x
x = -11

Tn= 4*n -11

Use this formula to find T71:
T71= 4*(71) -11
= 284 - 11
= 283

Kudos [?]: 90 [0], given: 2

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7787

Kudos [?]: 18094 [0], given: 236

Location: Pune, India
Re: nth term of sequence [#permalink]

Show Tags

24 Nov 2010, 19:59
shrive555 wrote:
The nth term (tn) of a certain sequence is defined as
tn = tn-1 + 4. If t1= -7 then t71 =

OA=273

I see you are working with sequences and series today. The story I wrote in response to your previous question will work perfectly well here too since this is an arithmetic progression too. If you understand it, you will get this question on your own. Go back and read it again and try this question again. If you don't get it, let me know what you don't understand in the theory.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for \$199

Veritas Prep Reviews

Kudos [?]: 18094 [0], given: 236

Non-Human User
Joined: 09 Sep 2013
Posts: 14949

Kudos [?]: 287 [0], given: 0

Re: The nth term (tn) of a certain sequence is defined as tn = t [#permalink]

Show Tags

05 Oct 2017, 06:46
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

Kudos [?]: 287 [0], given: 0

Re: The nth term (tn) of a certain sequence is defined as tn = t   [#permalink] 05 Oct 2017, 06:46
Display posts from previous: Sort by

The nth term (tn) of a certain sequence is defined as tn = t

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

 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®.