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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
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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
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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.
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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
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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
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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.
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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



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