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

 It is currently 04 Jul 2015, 23:58

### 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

# If the square root of the product of three distinct positive

Author Message
TAGS:
Senior Manager
Joined: 19 May 2004
Posts: 291
Followers: 1

Kudos [?]: 9 [0], given: 0

If the square root of the product of three distinct positive [#permalink]  15 Nov 2004, 12:24
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If the square root of the product of three distinct positive integers is equal to the largest of the three numbers, what is the product of the two smaller numbers?

(1) The largest number of the three distinct numbers is 12.
(2) The average (arithmetic mean) of the three numbers is 20/3
Director
Joined: 07 Nov 2004
Posts: 690
Followers: 5

Kudos [?]: 30 [0], given: 0

I think its A.

Translating the question stem: x<y<z and sqrt(xyz) = z ie: xyz = z^2 or xy = z

S(1): z = 12 => xy = 12 sufficient
S(2): x+y+z = 20 insufficient
Senior Manager
Joined: 19 Oct 2004
Posts: 318
Location: Missouri, USA
Followers: 1

Kudos [?]: 26 [0], given: 0

I'll go with D.

agree with whatever gayathri said except statement 2---

x+y+z=20

we know xy=z.

hence, x+y+xy=20
lets try n find two values for x and y such that the above eq. is satisfied.
its possible only when x=6, y=2 or x=2 and y=6. eitherways, xy=12.
hence, statement 2 is SUFFICIENT.

Hence, D.
_________________

Let's get it right!!!!

Director
Joined: 31 Aug 2004
Posts: 610
Followers: 3

Kudos [?]: 50 [0], given: 0

Will go with D too.

1st statement is enough ok

2nd statement means that, assuming a, b, c are the 3 positive integers, ab=c and (a+b+c)/3=20/3 id est a+b+ab=20 : this is true only if a=2 and b=6 or a =6 and b=2 (ab=12)

So statement 2 is enough
Senior Manager
Joined: 19 May 2004
Posts: 291
Followers: 1

Kudos [?]: 9 [0], given: 0

I thought this was a trick one
Well done!
Director
Joined: 07 Nov 2004
Posts: 690
Followers: 5

Kudos [?]: 30 [0], given: 0

I seem to have this problem with DS where I rush to the answer too soon
Similar topics Replies Last post
Similar
Topics:
If the square root of the product of three distinct positive 5 10 Aug 2009, 09:59
If the square root of the product of three distinct positive 9 27 May 2008, 23:42
If the square root of the product of three distinct positive 3 15 Jul 2007, 19:26
If the square root of the product of three distinct positive 7 10 Nov 2005, 23:53
If the square root of the product of three distinct positive 11 09 Nov 2005, 18:42
Display posts from previous: Sort by