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Symbol denotes the least integer greater than or equal to d,

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Director
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Symbol denotes the least integer greater than or equal to d, [#permalink] New post 12 Jun 2007, 01:44
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A
B
C
D
E

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0% (00:00) correct 0% (00:00) wrong based on 1 sessions
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Symbol [d] denotes the least integer greater than or equal to d, is [2d]=0?
1). [d]=0
2). [3d]=0

OA later.
Senior Manager
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Re: DS Least Integer [#permalink] New post 12 Jun 2007, 01:57
stmt 1: [d]=0 => -1< d <= 0. insufficient. (-2 < 2d <=0)

stmt 2: [3d]=0 => -1/3 < d <=0. sufficient. (-2/3 < 2d <= 0)

my answer. B.
Director
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 [#permalink] New post 12 Jun 2007, 06:10
Think its D, but not sure.

Rewrote the question to say x instead of [d]. So.. x >= d

So x = 0 then d = 0 (Since we said x is the least possible int to make x>= d true, so equal) and 2(0) = 0. Suff.

and 3x = 0 so x = 0 then 2(0) = 0. Suff.

OA?
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 [#permalink] New post 12 Jun 2007, 10:26
I think It is C.

using 1 we get d > 0 or d = 0
using 2) we get [3d] = 0 means d >0 or d = 0

so if we take both 1 and 2 it says d = 0
  [#permalink] 12 Jun 2007, 10:26
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Symbol denotes the least integer greater than or equal to d,

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