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# Untitled.jpg On the number line shown, is zero halfway

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Intern
Joined: 23 Jun 2009
Posts: 47
Untitled.jpg On the number line shown, is zero halfway [#permalink]

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27 Jul 2009, 01:56
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On the number line shown, is zero halfway between r and s?

1) s is to the right of zero.
2) The distance between t and r is the same as the distance between t and -s.
Director
Joined: 03 Jun 2009
Posts: 781
Location: New Delhi
WE 1: 5.5 yrs in IT
Re: ON THE NUMBER LINE SHOWN... [#permalink]

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27 Jul 2009, 02:12
I think the correct answer should be C

1) s is to the right of zero. - insufficient

2) The distance between t and r is the same as the distance between t and -s. -insufficient
This option can be interpreted in two ways
1st, when s is on the left of zero
<-------r---------s--0--t---------------(-s)---->

2nd, when s is on the right of zero. In this case, r and -s will lie at the same point.
<-------r(-s)---------0---------s--t------------->

Together: Sufficient, as only 2nd case (in option 2) would be possible
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Director
Joined: 05 Jun 2009
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WE 1: 7years (Financial Services - Consultant, BA)
Re: ON THE NUMBER LINE SHOWN... [#permalink]

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27 Jul 2009, 09:44
In 2nd, there will be two more cases

<-------r-----t-----(-s)----0----s---->

<-------r(-s)-----t----0----s---->
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Director
Joined: 03 Jun 2009
Posts: 781
Location: New Delhi
WE 1: 5.5 yrs in IT
Re: ON THE NUMBER LINE SHOWN... [#permalink]

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27 Jul 2009, 09:50
sudeep wrote:
In 2nd, there will be two more cases

<-------r-----t-----(-s)----0----s---->

<-------r(-s)-----t----0----s---->

Not sure, if we can re-arrange the sequence in which all the letters are given in the original diagram. I would prefer sticking to the same sequence as given in question.
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Manager
Joined: 21 Jun 2009
Posts: 150
Re: ON THE NUMBER LINE SHOWN... [#permalink]

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27 Jul 2009, 09:54
Shouldn't the case that sudeep mention be taken care of in bigoyal's 1st case?

Re: ON THE NUMBER LINE SHOWN...   [#permalink] 27 Jul 2009, 09:54
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