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Какова вероятность того, что из группы в 20 студент при случайном выборе старостой станет Иванов, а профоргом -Петрович, если в группе есть два студента по фамилии Иванов и один по фамилии Петров?
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Предмет:
Математика -
Автор:
pennyconrad - 6 лет назад
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Ответы 2
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1)2/20=0,1 и 2) 1/20=0,05
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Автор:
moses - 6 лет назад
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0
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ответ очень прост просто узнаёш сколько у тебя вариантов ответа и делишь 1)2/20=0.1 2)1/20=0.05
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Автор:
konner9sgw - 6 лет назад
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0
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Read the story about Toni Bently. Fill in the gaps (1-6) with the correct sentences (a-f)
Tony Bently began her ballet lessons when she was three. When she was ten, she went to a New York school. (1)________. Now there were ballet lessons every day, and in her old school there was only one lesson a week. The pupils often went to the theatre. I saw Swan Lake. It was wonderful. I wanted to become a great dancer. One day at the end of the school year in New York, her mother heard about the School of American Ballet. Toni went to that school. With five other girls she did some exercises. (2) ___________________. She was the best girl.
When Toni was eleven , her life changer. She got the role in a New York City Ballets performance. Toni and eight other young girls danced there. (3) _________________________. It was very exciting. When Toni was thirteen, she had ballet dancing two or three times a day. (4)____________________. She stayed at the School of American Ballet for seven years. When Toni was eighteen she joined the New York City It was fantastic. But my first year was very difficult. (5)__________________. Toni visited London, Paris, Copenhagen and other cities. But soon she decided to leave the ballet and started travelling. She went to Europe. (6) _________________. Now Toni Bently has become the author of several books about the famous ballerinas. Toni says now Ballet has changed my life. Im happy that i was a ballet dancer of the New York City Ballets.
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