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If x and y are integers, is k the square of an integer? (1)

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If x and y are integers, is k the square of an integer? (1) [#permalink] New post 22 May 2004, 07:04
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A
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C
D
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If x and y are integers, is k the square of an integer?

(1) k = (x^2)(y^2)
(2) sqrt(k) = 4
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 [#permalink] New post 22 May 2004, 07:12
Clearly each individual so (d)
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 [#permalink] New post 22 May 2004, 07:23
I agree with you but the answer key I have is "B"........
Maybe, the key is incorrect??
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 [#permalink] New post 22 May 2004, 14:27
k = (xy)^2 or (-xy)^2

The indefinite article an makes the answer D.
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 [#permalink] New post 26 May 2004, 18:43
hallelujah1234 wrote:
k = (xy)^2 or (-xy)^2

The indefinite article an makes the answer D.


I got a different answer,
K=x^2 * y^2
if x is 3 and y is 2, then we have k = 36, which means it's a square of 6.
pick another pair, 3 and 1 for example, and you get k = sqe. root of 10
hence, it's not A

B works for obvious reasons,
hence the asnwer i got is B
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 [#permalink] New post 27 May 2004, 10:35
hallelujah1234 wrote:
k = (xy)^2 or (-xy)^2

The indefinite article an makes the answer D.



I got a different answer,
K=x^2 * y^2
if x is 3 and y is 2, then we have k = 36, which means it's a square of 6.
pick another pair, 3 and 1 for example, and you get k = sqe. root of 10 - Not correct - it is 9 hence, it's not A

B works for obvious reasons,
hence the asnwer i got is B
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Re: DS_3_17 [#permalink] New post 28 May 2004, 13:12
becoolja wrote:
If x and y are integers, is k the square of an integer?

(1) k = (x^2)(y^2)
(2) sqrt(k) = 4


(1) is not sufficient because the only way to know for sure that k is a perfect square is if x^2=y^2. Since this information cannot be derived by the statement then there is no way of knowing that k is a perfect square.

(2) sqrt(k) = 4
square both sides...k = 16,
Statement (2) is sufficient.

The answer is B
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Re: DS_3_17 [#permalink] New post 28 May 2004, 13:18
sofere wrote:
becoolja wrote:
If x and y are integers, is k the square of an integer?

(1) k = (x^2)(y^2)
(2) sqrt(k) = 4


(1) is not sufficient because the only way to know for sure that k is a perfect square is if x^2=y^2. Since this information cannot be derived by the statement then there is no way of knowing that k is a perfect square.

(2) sqrt(k) = 4
square both sides...k = 16,
Statement (2) is sufficient.

The answer is B


Ignore this...I am very very wrong. Sorry. As usual Halle is right.

lastochka wrote:
I got a different answer,
K=x^2 * y^2
if x is 3 and y is 2, then we have k = 36, which means it's a square of 6.
pick another pair, 3 and 1 for example, and you get k = sqe. root of 10
hence, it's not A

B works for obvious reasons,
hence the asnwer i got is B


3 and 1 does work...k = 3^2 * 1^1 = 9 * 1 = 9 NOT 9 +1 = 10
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 [#permalink] New post 28 May 2004, 16:50
For (1): what if x=0? Could it be the factor that points that A is incorrect? Just asking.... :)
  [#permalink] 28 May 2004, 16:50
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