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abhishek kolipaka Grade: 12
        

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

Answers : (1)

AskiitianExpert Shine
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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