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Ryabushko A.P. DHS 18.1 option 21
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DHS - 18.1
№1.21. At a meeting of 12 people shook hands. How many handshakes were made at the same time?
№2.21. On the chessboard of 64 squares at random, put two rooks white and black. What is the probability they will not "beat" to each other?
№3.21. The probability of hitting the target the first shot in one shot is 0.7; second - 0.5. Find the probability that the target will be destroyed: a) two arrows; b) at least one direction; c) only one shooter.
№4.21. The instrument consists of two units of the same type and the second type of three nodes. .............
№5.21. Among the details made the workers an average of 2% of non-standard. ..........
№6.21. The probability of occurrence of an event in each of the 900 independent trials is 0.5. Find the probability ......
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