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# Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1

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Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink]

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05 Sep 2006, 09:33
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Is a product of three integers XYZ a prime?

(1) X=â€“Y
(2) Z=1

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Manager
Joined: 25 May 2006
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05 Sep 2006, 09:50
C

St1: Insuff
St2: Insuff

St1 and St2: Suff

If I'm correct there are no negative prime numbers.
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Who is John Galt?

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Re: Prime numbers properties DS [#permalink]

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05 Sep 2006, 09:50
yezz wrote:
Is a product of three integers XYZ a prime?

(1) X=â€“Y
(2) Z=1

Statement 1: Two different integers, doesn`t matter what z is. Invalidates the definition of prime SUFF

Statement 2: No info about X or Y. INSUFF

(A)

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05 Sep 2006, 09:56
X & Y wrote:
C

St1: Insuff
St2: Insuff

St1 and St2: Suff

If I'm correct there are no negative prime numbers.

I can't confirm the source, but apparently -ive prime numbers do exist:

http://www.mazes.com/primes/negative.html

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Retired Moderator
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05 Sep 2006, 10:00
there is no -ve prime numbers

because then they will have three divisors ( themselfes - 1 and -ve one) thus violates the difinition of a prime numbers

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Manager
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05 Sep 2006, 10:03
_________________

Who is John Galt?

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05 Sep 2006, 10:09
I say this is C...

the question stem doesnt say if the XYZ are distinct...

OK, lets see...

(1) x=-y
say y=-1, thenx=1, z=-3, product x*y*z=3..which is a prime..

it can also be ...y=1, x=-1, z=1, -1 is not a prime insuff

(2) z=1...doesnt tell much...insuff

together...we know that product of X*Y*Z is negative, which in GMAT world is never a prime..C it is..

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05 Sep 2006, 10:24
GMATT73 wrote:
X & Y wrote:
C

St1: Insuff
St2: Insuff

St1 and St2: Suff

If I'm correct there are no negative prime numbers.

I can't confirm the source, but apparently -ive prime numbers do exist:

http://www.mazes.com/primes/negative.html

yes they do exist but for GMAT purpose you can assume that there are no -ve prime numbers.
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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Current Student
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05 Sep 2006, 10:31
ps_dahiya wrote:
GMATT73 wrote:
X & Y wrote:
C

St1: Insuff
St2: Insuff

St1 and St2: Suff

If I'm correct there are no negative prime numbers.

I can't confirm the source, but apparently -ive prime numbers do exist:

http://www.mazes.com/primes/negative.html

yes they do exist but for GMAT purpose you can assume that there are no -ve prime numbers.

HARDWIRED

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Retired Moderator
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05 Sep 2006, 10:50
GMATT73... GO MAN GO YOU ARE THE ONE (KILL M ALL)

Kudos [?]: 443 [0], given: 49

05 Sep 2006, 10:50
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