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# DS Ques

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Manager
Joined: 14 May 2007
Posts: 182
Location: India

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14 Apr 2009, 06:08
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Hi Guys,

I came across a DS Ques. Unfortunately I do not know the OA so will be glad if anyone can help me out to confirm it.

Q-1) If r and q are integers, what is the value of (5^r)(3^q+1)

(1) (5^r) (3^q) = 729
(2) r + q = 6

************************************************

I think the answer should be A. This is because in A we can say 5^0 * 3^6 = 729 so we know r and q. And in the second one r can be 1 q can be 5 and we can get more combinations.

What do you guys think?
Manager
Joined: 19 Oct 2008
Posts: 91

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14 Apr 2009, 09:03
Agree. Question can also be written as 5^r*3^q*3^1=?

1) 5^r*3^q= 729

2) r+q=6

Hence A.
Intern
Joined: 05 Jun 2007
Posts: 48
Schools: CMU, Ross, Kellogg, Case, OSU, Stanford, Kelley

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14 Apr 2009, 12:33
The ans should be A

We need to get the values for r & q in order to solve the Q. Any stmt that clearly gives us the values will be suff.

Stmt 1 : (5^r)(3^q) = 729 ; Frm this statement its clear that we can get the values for r & q
(r=0 & q=6 ; though this step is not necessary)
Hence it is suff

Stmt 2 : r+q = 6 ; We cannot get unique values for r & q
Hence it is insuff
Manager
Joined: 19 Aug 2006
Posts: 232

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14 Apr 2009, 16:41
Agree with A.

stmnt 1 - 729*3 is the value
Manager
Joined: 14 May 2007
Posts: 182
Location: India

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15 Apr 2009, 21:31
Thank you everyone for your help.
Re: DS Ques   [#permalink] 15 Apr 2009, 21:31
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