Предмет: Математика, автор: shumak502

решить: 4 конверта без марок и три марки разного достоинства. Сколько способов выбора конвертов?Пожалуйста с порядком решения.

Ответы

Автор ответа: sonya098sonny

для 1 марки есть 4 способа выбрать конверт, для второй 3 способа выбрать конверт, а для третей 2 способа + все зависит од порядка выбора марок(их 3)
9*3=27

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Алгебра, автор: safasfasfsasafsfasfa

Выполнить действие
(3m²-m+2)*5m³ =

7 лет назад

Предмет: Английский язык, автор: 15092008z0l

СРОЧНО!!! даю 35 б
The control-reading for the 6th form pupils ( Дайте повну відповідь на запитання )
the first term
I. Read the text and do the tasks.
A Smart Lesson
Harry was always making excuses for forgetting to do things. His usual excuse was "I was too busy" or "I
didn't have time". Harry's parents were worried about him. "He mustn't go through life making excuses
all the time", his father said. "No one will trust him to do anything. He won't be able to keep a job. No
sensible girl will want to marry him".
"I don't know what we can do", his mother said.
"I have an idea", his father said. "If this doesn't work, nothing will".
The next day was Harry's birthday. He was really looking forward to getting exciting presents. He woke
up expecting his parents to wish him "Happy Birthday!" but all they said was "Good morning. Harry.
Hurry, or you'll be late for school". There were no presents, not even a card. He was very disappointed.
"Never mind", he thought. "There'll be a surprise for me after school". But there wasn't. Sadly he said to
his parents at dinner, "Today's my birthday". "Oh!" his father said. "So it is. I forgot.'
"So did I", his mother said. "How could you forget?" Harry asked. "There must be a reason". "Well, yes",
his father said. "We have a really good excuse for forgetting your birthday, Harry. We didn't remember
your birthday because we were too busy". Poor Harry. He never had a silly excuse for not doing
something again.
1. Answer the questions.
1) What did Harry make excuse for?
2) Whose birthday was it the next day?
3) What was he hoping to get?
4) What was he expecting when he woke up?
5) What did he get for his birthday?

7 лет назад

Предмет: Биология, автор: kharisovrob07

Установите последовательность стадий развития пресноводной гидры при половом размножении, начиная с образования гамет.
1) оплодотворение и образование зиготы;
2) личинка покрывается толстой оболочкой и зимует;
3) образование гамет;
4) взрослая гидра;
5) активное деление клеток весной, образование молодой гидры;
6) формирование личинки – плауны
Помогите пж!!!!!!!!!!!

7 лет назад

Предмет: Химия, автор: Листва

Какая масса сульфида выпадет в осадок при пропускании через 20%-ный раствор нитрата свинца, массой 200 г, сероводорода объемом 10 л. (н.у.)?

10 лет назад

Предмет: История, автор: POPOLO

Дайте определение капиталистическому хозяйству, и те факты даказывающие её сушествование в Нидерландах.

10 лет назад