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There are 5 locks and 5 keys. What is the minimum number of

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There are 5 locks and 5 keys. What is the minimum number of [#permalink] New post 24 Nov 2005, 04:41
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50% (00:00) correct 50% (00:00) wrong based on 3 sessions
There are 5 locks and 5 keys. What is the minimum number of tries you can find the proper keys for all the 5 locks?

(1) 1
(2) 2
(3) 3
(4) 4
(5) 5
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 [#permalink] New post 24 Nov 2005, 06:38
if luck involves ...there're minimumly 4 tries , e.g , you get the correct key for corresponding lock each try right away ...after finding 4 pairs ..the rest will be known without need to try.
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 [#permalink] New post 24 Nov 2005, 07:05
laxieqv wrote:
if luck involves ...there're minimumly 4 tries , e.g , you get the correct key for corresponding lock each try right away ...after finding 4 pairs ..the rest will be known without need to try.


Laxie always makes these problems appear effortless. :-D Yes, it must be 4 different tries.
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 [#permalink] New post 24 Nov 2005, 20:04
GMATT73 wrote:
laxieqv wrote:
if luck involves ...there're minimumly 4 tries , e.g , you get the correct key for corresponding lock each try right away ...after finding 4 pairs ..the rest will be known without need to try.


Laxie always makes these problems appear effortless. :-D Yes, it must be 4 different tries.


:yes

I'm :wall
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 [#permalink] New post 24 Dec 2005, 13:16
5 locks & 5 keys -- Requires atleast 4 tries..

Yep Ans is 4
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 [#permalink] New post 26 Dec 2005, 11:47
Kishore wrote:
Can someone explain how?


As luck would have it, each time you insert a key, it would be the right one.

So we have 5 keys. If from 1st-4th time we inserted a key and it was right, there is no need to try for the 5th time because we already know the one that is left must work.
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  [#permalink] 26 Dec 2005, 11:47
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There are 5 locks and 5 keys. What is the minimum number of

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