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

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yezz
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Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink] New post   05 Sep 2006, 09:33
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Is a product of three integers XYZ a prime?

(1) X=–Y
(2) Z=1



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Re: Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink] New post   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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Re: Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink] New post   05 Sep 2006, 09:50
yezz wrote:
Is a product of three integers XYZ a prime?

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

https://www.mazes.com/primes/negative.html
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Re: Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink] New post   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

:wink:
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Re: Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink] New post   05 Sep 2006, 10:03
Correct, it's all about patterns.
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Re: Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink] New post   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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Re: Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink] New post   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:

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


yes they do exist but for GMAT purpose you can assume that there are no -ve prime numbers.
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Re: Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink] New post   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:

https://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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Re: Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink] New post   05 Sep 2006, 10:50
GMATT73... GO MAN GO YOU ARE THE ONE (KILL M ALL) :m16

:lol:



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Re: Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 [#permalink]
05 Sep 2006, 10:50
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