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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Fri May 07, 2010 2:59 am

A certain club has exactly 5 new members at the end of its first week. Every subsequent week, each of the previous week’s new members (and only these members) bring exactly x new members into the club. If y is the number of new members brought into the club during the twelfth week, which of the following could be y?
(A) 3^11 × 5^11
(B) 3^11 × 5^12
(C) 3^12 × 5^12
(D) 30^12
(E) 60^12

The mind is everything. What you think you become. –Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

Source: Beat The GMAT — Problem Solving | Fri May 07, 2010 2:59 am

liferocks: Legendary Member; Posts: 576; Joined: Sat Mar 13, 2010 8:31 pmFollowed by: 1 member; Thanked: 97 times

by liferocks » Fri May 07, 2010 3:39 am

wk1 5
wk2 5x
wk3 5x^2

so new members in the end of nth week 5x^(n-1)

only option B can be expressed in this form
hence ans option B

“If you don't know where you are going, any road will get you there.”
Lewis Carroll

ansumania: Master | Next Rank: 500 Posts; Posts: 301; Joined: Sun Mar 21, 2010 3:18 pm; Thanked: 4 times

by ansumania » Fri May 07, 2010 9:45 am

IMO B;

the no. of members brought during 12th week= X^11*5

there has to be an additional 5.

LoveTheGMAT: Senior | Next Rank: 100 Posts; Posts: 43; Joined: Fri Dec 18, 2009 8:15 pmFollowed by: 1 member; Thanked: 4 times

by LoveTheGMAT » Wed May 26, 2010 10:01 pm

What is the source of this question?
I downloaded a PDF from a website and printed it and this question is in it. Just curious where it came from

Thanks

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Thu May 27, 2010 2:10 am

LoveTheGMAT wrote:What is the source of this question?
I downloaded a PDF from a website and printed it and this question is in it. Just curious where it came from

Thanks

source may be same as yours

The mind is everything. What you think you become. –Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

LoveTheGMAT: Senior | Next Rank: 100 Posts; Posts: 43; Joined: Fri Dec 18, 2009 8:15 pmFollowed by: 1 member; Thanked: 4 times

by LoveTheGMAT » Thu May 27, 2010 7:23 am

Yeah, but where did you get it? I don't know the source anymore after I printed it.
Now I am not sure if these problems are worth doing.
Its #5 on my document, but I don't know where I printed this document.

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Fri May 28, 2010 1:01 am

LoveTheGMAT wrote:Yeah, but where did you get it? I don't know the source anymore after I printed it.
Now I am not sure if these problems are worth doing.
Its #5 on my document, but I don't know where I printed this document.

I receive doubts as pm, reply to those accordingly; and forward the possible GMAT queries here. It's a possible GMAT query, which is more important for me to know than the source.

So, it's a possible GMAT query, hence it's worth doing.

The mind is everything. What you think you become. –Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

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