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PS minimum

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Director
Director
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Joined: 02 Mar 2006
Posts: 582
Location: France
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Kudos [?]: 27 [0], given: 0

PS minimum [#permalink] New post 11 Mar 2006, 14:22
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Hi,

I don't really understand this pb:

If a+b+c+d is a positive number, a minimum of x of the numbers a,b,c, and d must be positive where x equal to
0
1
2
3
4
Manager
Manager
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Joined: 20 Mar 2005
Posts: 201
Location: Colombia, South America
Followers: 1

Kudos [?]: 6 [0], given: 0

Re: PS minimum [#permalink] New post 11 Mar 2006, 15:23
karlfurt wrote:
Hi,

I don't really understand this pb:

If a+b+c+d is a positive number, a minimum of x of the numbers a,b,c, and d must be positive where x equal to
0
1
2
3
4


I would say 1

as we are adding, we can have 3 negative numbers but if the sum of those three is less than the amount of the only one that is positive, then the sum of a+b+c+d would be positive
Director
Director
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Joined: 02 Mar 2006
Posts: 582
Location: France
Followers: 1

Kudos [?]: 27 [0], given: 0

 [#permalink] New post 11 Mar 2006, 15:36
You're right!

I just understood.

I tought x = min(a,b,c,d)... :?
Senior Manager
Senior Manager
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Joined: 22 Nov 2005
Posts: 482
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 [#permalink] New post 11 Mar 2006, 18:55
I also think it is 1. as explained above there could be 3 -ve and 1 +ve, Since 1 is the minimum value > 0. So answer is 1
  [#permalink] 11 Mar 2006, 18:55
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