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`        an inefficient secretary places  5 different letters into 5 different addressed envolopes at random find the probability that atleast one of the letters will arrive proper destination`
8 years ago

10 Points
```										Hi
the probability that atleast one of the letter goes in the right envelope = 1- (probability that none of the letters go in the right envelope)
now, total ways = 5! = 120
ways that none of the letters go in the right envelope = 4! = 24
probability that none of the letters go in the right envelope = 24/120 = 1/5
probability that atleast one of the letter goes in the right envelope = 1 - 1/5 = 4/5
```
8 years ago
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