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x, y, z are numbers on the number line. Is x<y<z? 1)

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Senior Manager
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x, y, z are numbers on the number line. Is x<y<z? 1) [#permalink] New post 27 Apr 2006, 22:41
x, y, z are numbers on the number line. Is x<y<z?

1) |y-x| + |y-z| = |z-x|

2) x<z
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Re: xyz on number line [#permalink] New post 27 Apr 2006, 23:32
getzgetzu wrote:
x, y, z are numbers on the number line. Is x<y<z?

1) |y-x| + |y-z| = |z-x|

2) x<z



(1) remainds me of the triangle inequality
|x-y| + |y-z| >= |x-z|

so is just equal if x<y<z or x>y>z
insuff.

(2) insuff.

together works

C
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Re: xyz on number line [#permalink] New post 27 Apr 2006, 23:34
conocieur wrote:
getzgetzu wrote:
x, y, z are numbers on the number line. Is x<y<z?

1) |y-x| + |y-z| = |z-x|

2) x<z



(1) remainds me of the triangle inequality
|x-y| + |y-z| >= |x-z|

so is just equal if x<y<z or x>y>z
insuff.

(2) insuff.

together works

C


What happens if y=z or y=x?
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"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

- Bernard Edmonds

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Re: xyz on number line [#permalink] New post 27 Apr 2006, 23:57
giddi77 wrote:
conocieur wrote:
getzgetzu wrote:
x, y, z are numbers on the number line. Is x<y<z?

1) |y-x| + |y-z| = |z-x|

2) x<z



(1) remainds me of the triangle inequality
|x-y| + |y-z| >= |x-z|

so is just equal if x<y<z or x>y>z
insuff.

(2) insuff.

together works

C


What happens if y=z or y=x?


yes, I didn't notice that one, mmm, should we go for E then?
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 [#permalink] New post 28 Apr 2006, 00:44
It works for x=y or y=z


if x=0, y=0, z=2


0 + 2 = 2


if x=0, y=2, z=2

2 + 0 = 2
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 [#permalink] New post 28 Apr 2006, 00:46
sm176811 wrote:
It works for x=y or y=z


if x=0, y=0, z=2


0 + 2 = 2


if x=0, y=2, z=2

2 + 0 = 2



o yeah, the triangle inequality yes, but what about x<y<z

i guess that one doesn't hold
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 [#permalink] New post 28 Apr 2006, 00:47
conocieur wrote:
sm176811 wrote:
It works for x=y or y=z


if x=0, y=0, z=2


0 + 2 = 2


if x=0, y=2, z=2

2 + 0 = 2



o yeah, the triangle inequality yes, but what about x<y<z

i guess that one doesn't hold


What do you mean.. give an example!
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 [#permalink] New post 28 Apr 2006, 00:50
sm176811 wrote:
conocieur wrote:
sm176811 wrote:
It works for x=y or y=z


if x=0, y=0, z=2


0 + 2 = 2


if x=0, y=2, z=2

2 + 0 = 2



o yeah, the triangle inequality yes, but what about x<y<z

i guess that one doesn't hold


What do you mean.. give an example!


using your own numbers
x=0, y=2, z=2
both hold in (1) and (2)
but since y=z
then x<y<z doesn't work

also x=0 y=1 z=2
hold in (1) and (2)
then x<y<z does work

since can obtain two different answers there is no enough info
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 [#permalink] New post 28 Apr 2006, 00:56
Ah!! Missed that :P I guess the answer is E then!
  [#permalink] 28 Apr 2006, 00:56
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