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dullsword (钝剑) 于 (Sat May 5 20:28:39 2007) 提到:
there are n coins randomly placed on a table. n is a very big number. now
you apply the following procedure to coins on this table:
1. randomly select 1 coin from the n coins and turn the coin over.
2. randomly select 1 coin from the n coins and
i) turn it over if it shows tail.
ii) do nothing if it shows head.
question: after applying the procedure m times, m is a very big number, how
many heads |
|
