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by ukr.net » Mon Dec 03, 2007 7:13 am
What is the value of k^2-k?
(1) The value of k - 1/k is 1.
(2) The value of 2k -1 is Square Root of 5

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient

ANS is D ???How to solve?
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Source: — Data Sufficiency |
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by camitava » Mon Dec 03, 2007 7:17 am
ukr.net,
From stmt - 1,
k - 1/k = 1
so k^2 - 1 = k
From stmt - 2,
2k - 1 = sqrt(5)
So k = (sqrt(5) + 1)^2/2

So IMO D. - Have u got me ukr.net?
Correct me If I am wrong


Regards,

Amitava
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by StarDust845 » Tue Dec 11, 2007 1:09 pm
Why is the answer D?

I see it this way.

From stmt (1) we get k^2 - k - 1 = 0

If you solve this, you get k = (1 + Sqrt(5))/2 or k = (1 - sqrt(5))/2
So the answer can't be A or D.

From stmt (2) we can solve for k which is k = (1 + sqrt(5))/2.

So answer MUST be B. What am I doing wrong?

Calista.
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by jayhawk2001 » Tue Dec 11, 2007 5:40 pm
StarDust845 wrote:Why is the answer D?

I see it this way.

From stmt (1) we get k^2 - k - 1 = 0

If you solve this, you get k = (1 + Sqrt(5))/2 or k = (1 - sqrt(5))/2
So the answer can't be A or D.
We don't have to solve for k here. Question asks for k^2 - k.
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