GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 19 May 2019, 18:12

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

If a_n= 0.5* a_n+1, what is the value of a_7

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

Hide Tags

Current Student
Joined: 22 Jul 2014
Posts: 120
Concentration: General Management, Finance
GMAT 1: 670 Q48 V34
WE: Engineering (Energy and Utilities)
If a_n= 0.5* a_n+1, what is the value of a_7  [#permalink]

Show Tags

Updated on: 02 Aug 2014, 01:56
1
6
00:00

Difficulty:

55% (hard)

Question Stats:

60% (01:33) correct 40% (01:39) wrong based on 231 sessions

HideShow timer Statistics

If $$a_n= 0.5* a_{n+1}$$, what is the value of $$a_7$$ ?

(1) $$a_3 = 4$$
(2) $$a_7 - a_1 = 63$$

Originally posted by alphonsa on 01 Aug 2014, 21:46.
Last edited by Bunuel on 02 Aug 2014, 01:56, edited 1 time in total.
Edited the question.
Math Expert
Joined: 02 Sep 2009
Posts: 55150
Re: If a_n= 0.5* a_n+1, what is the value of a_7  [#permalink]

Show Tags

02 Aug 2014, 02:01
2
2
If $$a_n= 0.5* a_{n+1}$$, what is the value of $$a_7$$ ?

(1) $$a_3 = 4$$ --> $$a_3= 0.5* a_{4}$$. We can find $$a_4$$, the same way we can find any other term: $$a_5$$, $$a_6$$, $$a_7$$, ... Sufficient.

(2) $$a_7 - a_1 = 63$$ --> $$a_7 - \frac{1}{2}*a_2 = 63$$ --> $$a_7 - (\frac{1}{2})^2*a_3 = 63$$ ... --> $$a_7 - (\frac{1}{2})^6*a_7 = 63$$ --> we can get the value of $$a_7$$. Sufficient.

_________________
Non-Human User
Joined: 09 Sep 2013
Posts: 10952
Re: If a_n= 0.5* a_n+1, what is the value of a_7  [#permalink]

Show Tags

29 Nov 2018, 12:16
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.
_________________
Re: If a_n= 0.5* a_n+1, what is the value of a_7   [#permalink] 29 Nov 2018, 12:16
Display posts from previous: Sort by

If a_n= 0.5* a_n+1, what is the value of a_7

 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®.