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There are 7 keys in a key ring. If two more keys are to be

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Joined: 11 May 2008
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Re: probability [#permalink]

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New post 01 Aug 2008, 09:31
WELL, to tell u frankly, 1/4 is the OA. but your explanation was fantastic. thats why .. :wink:

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Re: probability [#permalink]

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New post 31 Oct 2008, 08:57
the answer should be 1/4

after the first key is in the ring- there are 8 rings and thus 8 gaps to insert the second key.

if the second key sould be ajacent to the first, it could be inserted in only 2 gaps out of 8, thus probability of 2/8=1/4.

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Re: probability   [#permalink] 31 Oct 2008, 08:57

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There are 7 keys in a key ring. If two more keys are to be

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