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If y ≠ 3 and is a prime integer greater than 2, which

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Joined: 31 Dec 1969
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If y ≠ 3 and is a prime integer greater than 2, which [#permalink] New post 20 Jun 2004, 02:24
If y ≠ 3 and is a prime integer greater than 2, which of the following must be true?

a x = y
b. y = 1
c. x and y are prime integers.

(A) None
(B) a only
(C) b only
(D) c only
(E) a and b

Can anyone say what is the right answer
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Re: prime integers [#permalink] New post 20 Jun 2004, 03:16
Anonymous wrote:
If y ≠ 3 and is a prime integer greater than 2, which of the following must be true?

a x = y
b. y = 1
c. x and y are prime integers.

(A) None
(B) a only
(C) b only
(D) c only
(E) a and b

Can anyone say what is the right answer


A. By the way, the stem says nothing about x...
Joined: 31 Dec 1969
Location: United States
Concentration: Marketing, Other
GMAT 1: 710 Q49 V38
GMAT 2: 660 Q V
GPA: 3.64
WE: Accounting (Accounting)
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Kudos [?]: 51 [0], given: 75150

 [#permalink] New post 20 Jun 2004, 09:37
If y ≠ 3 and 3x/y is a prime integer greater than 2, which of the following must be true? - This is the question.
I am sorry above the 3x/y missing earlier.

Thanks.
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 [#permalink] New post 20 Jun 2004, 21:57
I think the answer is B
Joined: 31 Dec 1969
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GMAT 1: 710 Q49 V38
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 [#permalink] New post 20 Jun 2004, 23:08
This question is from GMATPlus (Sec1 Q20) . And the answer reads A. I am unable to figure it out.
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 [#permalink] New post 21 Jun 2004, 03:43
It has to be (A),

a) x=y might not be true because, for 3x/y, we have x=5/3 and y=1
b) y=1 might not be true as y=5 and x=5 satisfy the equation.
c) X and Y are primes integers: Again might not be true, consider x=5/3 and y=5/7. (please note that in the initial question no where it is mentioned that x and y needs to be integer.)

Hope this helps!!
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 [#permalink] New post 23 Jun 2004, 06:17
The answer is A!

Because: From looking at the equation 3x/y (resulting in a prime greater than 2), we can tell that the answer can't be a multiple of 3 (a prime greater than 2). So if (b) were true, the answer would be 3x; if (c) were true then we don't know what prime we're considering so we may end up getting a decimal number. (a) is the only choice that gives us 3 for the answer.
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 [#permalink] New post 24 Jun 2004, 09:03
mba wrote:
It has to be (A),

a) x=y might not be true because, for 3x/y, we have x=5/3 and y=1
b) y=1 might not be true as y=5 and x=5 satisfy the equation.
c) X and Y are primes integers: Again might not be true, consider x=5/3 and y=5/7. (please note that in the initial question no where it is mentioned that x and y needs to be integer.)

Hope this helps!!


good catch with fractions!
  [#permalink] 24 Jun 2004, 09:03
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