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Difficult Math Question #35 - Alegebra

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Difficult Math Question #35 - Alegebra

by 800guy » Wed Oct 25, 2006 3:30 pm
If y ≠ 3 and 2x/y is a prime integer greater than 2, which of the following must be true?
I. x = y
II. y = 1
III. x and y are prime integers.

(A) None

(B) I only

(C) II only

(D) III only

(E) I and II
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by ajith » Wed Oct 25, 2006 11:01 pm
If y ≠ 3 and 2x/y is a prime integer greater than 2, which of the following must be true?
I. x = y
II. y = 1
III. x and y are prime integers.

(A) None

(B) I only

(C) II only

(D) III only

(E) I and II


Say, x=10 and y=4 , Which astisfies all the criteria in the question gives the prime number as 5, We can easily see that
none of 1 or 2 or 3 are satisfied in this example
So nothing must be true.

So, A is the answer
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by rajs.kumar » Thu Oct 26, 2006 2:12 am
Answer is none.

1. x = y => 2x/y = 2 which is equal to 2. Does not satisfy
2. y = 1 => 2x/y = 2x which cant be prime greater than 2. Does not satisfy
3. x and y are prime => 2x/y = 2 * real number which cant be prime greater 2.
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by limits660 » Thu Oct 26, 2006 3:14 am
With this question, I saw it but its missing a line. The line is "X and Y are held as constants." Does this affect the answer. I got this one wrong and I dont know why. The answer was still A
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by ajith » Thu Oct 26, 2006 3:38 am
It says only that X and Y represent a constant value rather than a variable one. I dont quite get what they mean by this

Still I dont think it will affect the answer, Jeff
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by 800guy » Fri Oct 27, 2006 3:09 pm
unfortunately i don't have an OA for this problem
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by rajs.kumar » Mon Oct 30, 2006 9:16 am
I also dont understand why constant values have to represented by variables. However, for all values of xy it holds good.
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by krishnamurthyu » Sat Aug 18, 2007 5:40 am
Given:
y != 3 , 2x/y={3,5,7,11....}=Val Set

1.x=y ;
then 2x/y = 2 not in = Val Set : Not True

2. y=1; then 2x/y = 2x ,where x =(-n,-1/n,0,1/n,n} not in =Val set = Not True

3.x and y are prime: then 2x/y are co-prime
2x/y=Not an Interger : Not True.

Ans:A=None
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