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 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
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