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There are 5 cars in a car dealer and 5 keys. The sales

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There are 5 cars in a car dealer and 5 keys. The sales [#permalink] New post 30 Jul 2008, 01:46
. There are 5 cars in a car dealer and 5 keys. The sales person doesn't know which key is for which car. If assign 5 keys to each car, which one below is impossible as the number of cars that will have the right key?
(A) 0
(B) 2
(C) 3
(D) 4
(E) 5
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Re: cars and keys [#permalink] New post 30 Jul 2008, 01:52
arjtryarjtry wrote:
. There are 5 cars in a car dealer and 5 keys. The sales person doesn't know which key is for which car. If assign 5 keys to each car, which one below is impossible as the number of cars that will have the right key?
(A) 0
(B) 2
(C) 3
(D) 4
(E) 5


D 4.

only 4 cars can not have right key... because, if that is the case then there is only one wrong car-key left, there has to be another car-key which is not a right combination....
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Re: cars and keys [#permalink] New post 30 Jul 2008, 09:29
4

because if we have 4 cars with right key, the remaining one should also have right key
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Re: cars and keys [#permalink] New post 03 Aug 2008, 11:09
arjtryarjtry wrote:
. There are 5 cars in a car dealer and 5 keys. The sales person doesn't know which key is for which car. If assign 5 keys to each car, which one below is impossible as the number of cars that will have the right key?
(A) 0
(B) 2
(C) 3
(D) 4
(E) 5


D is impossible since 4 cars if the keys are correct then ;left out key must unlock the left out car :-D good question
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Re: cars and keys [#permalink] New post 03 Aug 2008, 19:19
well, i did not understand this question.. even though i haveposted it ... can someone explain it in detail?
Re: cars and keys   [#permalink] 03 Aug 2008, 19:19
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