There are n letters and n addressed envelopes, the probability that all the letters are not kept in the right envelope, is

There are n letters and n addressed envelopes, the probability that al

1.	There are n letters and n addressed envelopes, the probability that all the letters are not kept in the right envelope, is
A.	\[\frac{1}{n!}\]
B.	\[1-\frac{1}{n!}\]
C.	\[1-\frac{1}{n}\]
D.	None of these
Answer» C. \[1-\frac{1}{n}\]

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There are n letters and n addressed envelopes, the probability that all the letters are not kept in the right envelope, is

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