Control Theory of Probability

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• 20 textbooks are randomly arranged on a library shelf, 6 of them are bound. The librarian takes 3 textbooks at random. Find the probability that at least two textbooks will be bound.
• The probability that the lamp will remain operational after 1000 hours of operation is 0.5. Find the probability that out of 6 lamps 4 will remain operational after 1000 hours of operation.

3.p_1=0.9,q_1=0.1 p_2=0.8 ,q_2=0.2,p_3=0.7,q_3=0.3

The law of distribution of a random variable - the number of devices activated during an accident.