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If the square root of the product of three distinct positive

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If the square root of the product of three distinct positive [#permalink] New post   15 Nov 2004, 13:24
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A
B
C
D
E

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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



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Re: If the square root of the product of three distinct positive [#permalink] New post   15 Nov 2004, 13:35
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
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Re: If the square root of the product of three distinct positive [#permalink] New post   15 Nov 2004, 14:09
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.
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Re: If the square root of the product of three distinct positive [#permalink] New post   15 Nov 2004, 14:24
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
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Re: If the square root of the product of three distinct positive [#permalink] New post   15 Nov 2004, 14:32
Yes, the answer is D.
I thought this was a trick one :?
Well done!
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Re: If the square root of the product of three distinct positive [#permalink] New post   15 Nov 2004, 19:15
My bad again :oops:

I seem to have this problem with DS where I rush to the answer too soon :cry:



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Re: If the square root of the product of three distinct positive [#permalink]
15 Nov 2004, 19:15
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