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a given x

by sanju09 » Sat Jan 07, 2012 3:54 am
For a given x, x - y is greatest when
(A) x is greatest
(B) y is greatest
(C) x is least
(D) y is least
(E) x is greatest and y is least



made up
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by neelgandham » Sat Jan 07, 2012 5:17 am
sanju09 wrote:For a given x, x - y is greatest when
(A) x is greatest
(B) y is greatest
(C) x is least
(D) y is least
(E) x is greatest and y is least

made up
E !

(A) x is greatest, let x = 100, y = 0, x-y = 100
(B) y is greatest, let x = 100, y = 100000, x-y <0
(C) x is least, let x = -100, y = 10000, x-y <0
(D) y is least, let x = 100, y = 0, x-y = 200
(E) x is greatest and y is least, x = 1000000, y = -1000000 , x-y = 2000000

Just random numbers used !
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by sanju09 » Mon Jan 09, 2012 1:18 am
neelgandham wrote:
sanju09 wrote:For a given x, x - y is greatest when
(A) x is greatest
(B) y is greatest
(C) x is least
(D) y is least
(E) x is greatest and y is least

made up
E !

(A) x is greatest, let x = 100, y = 0, x-y = 100
(B) y is greatest, let x = 100, y = 100000, x-y <0
(C) x is least, let x = -100, y = 10000, x-y <0
(D) y is least, let x = 100, y = 0, x-y = 200
(E) x is greatest and y is least, x = 1000000, y = -1000000 , x-y = 2000000

Just random numbers used !
I don't think that (E) is the best answer or the presentation is the best explanation to this question.
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by ronnie1985 » Mon Jan 09, 2012 1:50 am
Quite obvious
(E).
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by sanju09 » Mon Jan 09, 2012 1:56 am
ronnie1985 wrote:Quite obvious
(E).
Are we free to call greatest or least for an x which is already addressed as given?
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by shankar.ashwin » Mon Jan 09, 2012 2:15 am
sanju09 wrote:For a given x, x - y is greatest when
(A) x is greatest
(B) y is greatest
(C) x is least
(D) y is least
(E) x is greatest and y is least



made up
Yeah! Should be D, since x is already defined in the question stem.
But why would 'E' mention x is greatest - ?
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