It is currently 21 Oct 2017, 10:26

### 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

# In a sequence of terms in which each term is three times the

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Director
Joined: 02 Mar 2006
Posts: 575

Kudos [?]: 129 [0], given: 0

Location: France
In a sequence of terms in which each term is three times the [#permalink]

### Show Tags

30 Oct 2006, 07:37
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

In a sequence of terms in which each term is three times the previous term, what is the fourth term?

(1) The first term is 3.

(2) The second to last term is 3^10.

Kudos [?]: 129 [0], given: 0

Director
Joined: 10 Oct 2005
Posts: 713

Kudos [?]: 25 [0], given: 0

### Show Tags

30 Oct 2006, 08:35
))tricky question
IMHO A it is
1) is obvious
1st term is 1
second=3
third=9
and fourth =27
2)tricky The second to last term is 3^10.
insuff since we don't know how many terms there are in the sequence
_________________

IE IMBA 2010

Kudos [?]: 25 [0], given: 0

Manager
Joined: 29 Aug 2006
Posts: 156

Kudos [?]: 6 [0], given: 0

### Show Tags

30 Oct 2006, 08:57
This Seq is defined by
S={ n, 3n, 3^2 n. 3^3 n.....

From S1, n=3, so 4th term will be 81.
From S2, second last term is 3^10...but,since total nbr of terms in seq not given, we cannot say which is the 4th term.

Hence A.

Kudos [?]: 6 [0], given: 0

VP
Joined: 25 Jun 2006
Posts: 1161

Kudos [?]: 191 [0], given: 0

### Show Tags

31 Oct 2006, 00:27
only A.

2 is not suff, because the first could be 3, or 9, or 27 etc.

Kudos [?]: 191 [0], given: 0

Current Student
Joined: 29 Jan 2005
Posts: 5206

Kudos [?]: 434 [0], given: 0

### Show Tags

31 Oct 2006, 00:40
Yurik79 wrote:
Priyah wrote:
This Seq is defined by
S={ n, 3n, 3^2 n. 3^3 n.....

From S1, n=3, so 4th term will be 81.
From S2, second last term is 3^10...but,since total nbr of terms in seq not given, we cannot say which is the 4th term.

Hence A.

Oops you are right))it is 81

Good catch Yurik. Yes, for statement (2) we don't know the total number of terms..

(A)

Kudos [?]: 434 [0], given: 0

Manager
Joined: 04 May 2006
Posts: 171

Kudos [?]: 31 [0], given: 0

Location: paris

### Show Tags

31 Oct 2006, 03:30
You're right

must be A

for B, if first term n=1 then i(nb of terms)= 12 since the value of last term is determined by: n*3^(i-1)
if n=3 then i=11
so we cannot determin the 4th term value
_________________

time is not on my side

Kudos [?]: 31 [0], given: 0

VP
Joined: 28 Mar 2006
Posts: 1367

Kudos [?]: 38 [0], given: 0

### Show Tags

31 Oct 2006, 05:19
this is a GP(geometric progression)

A stands

Kudos [?]: 38 [0], given: 0

Manager
Joined: 07 Jun 2006
Posts: 109

Kudos [?]: 33 [0], given: 0

### Show Tags

31 Oct 2006, 12:04
Code:
this is a GP(geometric progression)

Trivikram,
Can you post the formulae for GP??

Like what we have for AP - the last term, Sum of n terms etc...
What formulae do we have for GP?

Also, HP is just the sum of reciprocal of terms in an AP.
Do we have formulae for that as well?

Kudos [?]: 33 [0], given: 0

31 Oct 2006, 12:04
Display posts from previous: Sort by

# In a sequence of terms in which each term is three times the

 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®.