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October 27th, 2014, 07:04 AM   #1
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Urns and balls

Hi,

It is not a homework. So do not hurry to answer. Take your time.

There are 14 urns.
Each urn could cointain at most 5 balls.
We place randomly 20 balls in the 14 urns.
We choose randomly one urn out of 14 and we place the first ball.
We do the same process for the remaining balls until we run out of the balls.
What is the probability that at the end of the process that at least one urn contains at least 3 balls?
What for at least one urn contains at least 4 balls or more?

Hard one?

Thank you
mobel is offline  
 
October 27th, 2014, 11:00 AM   #2
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We've currently got your question in our Q&A thread. Could you clarify there?
Hoempa is offline  
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