Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 10 Mar 2014, 18:22

### 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

# Sn=S(n-2)+11. Is 633 a term of the sequence? 1) S1=39 2)

Author Message
TAGS:
Senior Manager
Joined: 08 Aug 2005
Posts: 258
Followers: 1

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

Sn=S(n-2)+11. Is 633 a term of the sequence? 1) S1=39 2) [#permalink]  21 Apr 2006, 03:01
Sn=S(n-2)+11. Is 633 a term of the sequence?

1) S1=39
2) S2=43
Director
Joined: 05 Feb 2006
Posts: 905
Followers: 1

Kudos [?]: 22 [0], given: 0

C....

1) S_-1=28
2) S_0=32

That means a number must always be an even interger..... Answer No....
Director
Joined: 24 Oct 2005
Posts: 664
Location: London
Followers: 1

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

From statement 1-----

s(1) = 39
s(3) = 39 + 11
s(5) = 39 + 11 + 11 = 39 + (11*2)
s(7) = 39 + (11 * 3)

Can 633 be represented as 39 + (11*n) ?

633 = 39+ 11n
n = 54. Ans = yes. Therefore, 633 belongs to this sequence.

Statement 2 ----
s(2) = 43
s(4) = 43 + 11 = 54
s(6) = 43 + (11*2)

Can 633 be represented as 39 + (11*n) ? No .
Hence insufficient

Ans = A
Senior Manager
Joined: 08 Sep 2004
Posts: 259
Location: New York City, USA
Followers: 1

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

The first condition holds only for the odd n, and the second condition only for even n.

As per first condition -

a(2t+1) = a(1) + t*11 = 633

=> t = 54

So 2*54 + 1 = 109th term would be 633. Hence A.

No solution for second condition.
Manager
Joined: 04 Apr 2006
Posts: 63
Location: Land Of Opportunities
Followers: 0

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

Shouldn't the answer be D, as both are sufficient to answer eith Yes or No.
Similar topics Replies Last post
Similar
Topics:
A sequence is such that: 1/2, 1/4, 1/8, Then the tenth term 2 21 Mar 2005, 16:09
In the sequence 1, 2, 4, 8, 16, 32, , each term after the 1 25 Apr 2006, 11:34
What is the sixtieth term in the following sequence? 1, 2, 6 25 Apr 2006, 18:04
1 If the terms of a sequence are t1,t2,t3...tn what is the the 4 07 May 2006, 17:08
An=An-2 + 11, n > 2. Is 633 a term of the sequence? 1. 6 17 Jul 2007, 14:36
Display posts from previous: Sort by