There are n letters and n addressed envelops. The probability that each letter takes place in right envelop is

There are n letters and n addressed envelops. The probability that eac

1.	There are n letters and n addressed envelops. The probability that each letter takes place in right envelop is
A.	\[\frac{1}{n\,!}\]
B.	\[\frac{1}{(n-1)\,!}\]
C.	\[1-\frac{1}{n\,!}\]
D.	None of these
Answer» B. \[\frac{1}{(n-1)\,!}\]

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There are n letters and n addressed envelops. The probability that each letter takes place in right envelop is

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