3
Пошаговое объяснение:
Всего было n * (n - 1) / 2 игр между профессионалами (в каждой такой игре победил профессионал), 2n * (2n - 1)/2 игр между любителями (соответственно, в таких играх побеждали любители) и n * 2n = 2n^2 игр, в которых приняли участие профессионал и любитель (допустим, в x из них победил профессионал, и в 2n^2 - x победил любитель).
Оценим возможное отношение числа побед профессионалов к числу побед любителей, оно равно
[*}
Это отношение будет наименьшим при x = 0, когда все любители обыграли всех профессионалов, тогда оно равно (n - 1)/(8n - 2).
Это отношение будет наибольшим при x = 2n^2 (это соответствует всем поражениям любителей в матчах с профессионалами), значение отношения (5n - 1)/(4n - 2).
Найдем, при каких n 7/5 попадает в этот промежуток:
Итак, все возможные n - 1, 2 и 3. Заметим, что общее количество игр 3n (3n - 1)/2 должно быть кратно 7 + 5 = 12, это выполнено только для n = 3.
My name is Sergei. I want to tell about my family. My family consists of five people: mom, dad, grandma, grandpa and me. My mother's name is Irina, Igor papu- Venediktovich, babushku- Valentina, dedushku- Vasili Alexandrovich. My mom and dad went abroad in the summer. My grandmother likes to knit. A grandfather likes to help her in some kind of business.
I love my family so that she loves me all.
(Option 1)
My family.
I want to tell you about my favorite family. My family consists of mom, dad and me. My mother's name is Elena, father - Andrei Vladimirovich. Mom stays at home, it does not work, and my father is the director of the store. Mom knows and loves to knit. With Dad I'm a little vizhus because he works very hard. We have a cottage, and two dogs in the country. For dogs have to look. We as a family went to the United Arab Emirates. It was very interesting there. We swam in the sea, in the pool, sunbathing on the beach. We sailed on the ship. They dive straight from the ship. Only my dad diving and many other adults, because the ship was sailing slowly. Even in the United Arab Emirates, we went on a jeep. This excursion called "Jeep Safari". At the jeep we drove on the sand in the desert. There were camel thorns and some more beautiful, but poisonous plant. Me and my family was very interesting and fun. I'm having a good time with his family. I love my family.
( Option 2)