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

It is currently 21 Oct 2019, 14:15

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

If the sequence a1, a2, a3, ..., an is such that a1 = 6 and an = 2a

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58396
If the sequence a1, a2, a3, ..., an is such that a1 = 6 and an = 2a  [#permalink]

Show Tags

New post 03 Apr 2019, 23:16
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

77% (01:10) correct 23% (01:16) wrong based on 22 sessions

HideShow timer Statistics

GMAT Club Legend
GMAT Club Legend
User avatar
D
Joined: 18 Aug 2017
Posts: 5027
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member
Re: If the sequence a1, a2, a3, ..., an is such that a1 = 6 and an = 2a  [#permalink]

Show Tags

New post 04 Apr 2019, 02:17
Bunuel wrote:
If the sequence \(a_1\),\(a_2\), \(a_3\), ..., \(a_n\) is such that \(a_1 = 6\) and \(a_n = 2a_{(n - 1)}\) for \(n > 1\), then \(a_6 - a_5 =\)

A. 12

B. 48

C. 64

D. 96

E. 192


a1=6
a2=12
a3=24
a4=48
a5=96
a6==192
192-96 = 96
IMO D
Intern
Intern
avatar
B
Joined: 19 Jan 2017
Posts: 30
Location: India
Schools: IIM
GMAT 1: 530 Q48 V15
GMAT ToolKit User
Re: If the sequence a1, a2, a3, ..., an is such that a1 = 6 and an = 2a  [#permalink]

Show Tags

New post 09 Apr 2019, 23:27
an=2a(n−1) therefore a6 = 2 X a5

we will put this value in the given equation,

a6- a5 = 2 x a5 - a5 = a5

therefore ans is D.
GMAT Club Bot
Re: If the sequence a1, a2, a3, ..., an is such that a1 = 6 and an = 2a   [#permalink] 09 Apr 2019, 23:27
Display posts from previous: Sort by

If the sequence a1, a2, a3, ..., an is such that a1 = 6 and an = 2a

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





cron

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