Предмет: Математика, автор: Poyoije

Объяснения очень нужны, пожалуйста

3. Алфавит племени Пинг-Понг состоит из пяти букв: П, И, Н, Г, О. Словом является любая последовательность, состоящая не более чем из четырех букв, причем все буквы различны.
Сколько слов в языке племени Пинг-Понг?

4. Алфавит племени Пинг-Понг состоит из пяти букв: П, И, Н, Г, О. Словом является любая последовательность букв, состоящая не более чем из четырех букв, причем все буквы различны. Все слова написали на карточках и положили в конверт. Какова вероятность вытащит из конверта три трехбуквенных слова, в которых все буквы различны?

Ответы

Автор ответа: maslow200619

5 букв, следуя условию, 1,3,5 и 2,4 буквы одинаковые. На 1 место( соответственно на 3 и 5) возможно поставить 32 буквы, а на 2 и 4 -все, кроме тех, которые на 1. Тоесть 31. Всего вариантов 32*31 (32 на одно место, 31 на второе).

Ответ: 992

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Русский язык, автор: Rena021

каким способом образовано слово ключ?

2 года назад

Предмет: Английский язык, автор: simpopulka

ПОМОГИТЕ ПОЖАЛУЙСТА С ПЕРЕВОДОМ!!!
Football Crazy

A lot has changed since the days of one of the greatest English footballers, Sir Mathews, who died recently aged 85. At the top of his career he earned a maximum of $50 a week. Now players earn up to $20,000 a week! He continued playing football until he was fifty years old and was never ''booked'.
Football is one of the most popular sports in Britain. Children like to start playing as soon as they are old enough to kick the ball. They begin to follow their favourite team, either watching on television or going to matches with their friends and family. Football teams are divided into groups called leagues. The best teams are in the premier league, the rest are in the first, second, third and fourth divisions.
Supporters often buy the same shirt and shorts as the players. The styles change each season so the fans can find it very expensive to keep up.
Footballers are bought and sold by the managers of each team. The premier league has many international players who are highly paid in Britain. As a result many footballers have lifestyles similar to film celebrities or pop stars. In fast, two of the most famous people in Britain today are David Beckham, a footballer who plays for Manchester United and England, and his wife, Victoria, from the Spice Girls pop group. Some people have criticised David Beckham for spending more time on his celebrity lifestyle than on practising his football skills.
In the World Cup or European matches, the United Kingdom divides into four separate countries: England, Wales, Scotland and Northern Ireland. There is always great competition when England and Scotland play each other. Many Scottish fans will support any other team which is playing England, rather than cheer for their neighbours and fiercest rivals!

2 года назад

Предмет: Українська мова, автор: razvodovay

звукова схема слова знання???