🎓 Ze zbioru liczb {0, 1, 2, 3, ..., 2n} losujemy kolejno trzy liczby bez zwracania i sumujemy je. Oblicz liczbę elementów tego zbioru, wiedząc, że prawdopodobieństwo wylosowania trzech liczb, których suma jest liczbą nieparzystą, jest równe 43/85. - Odrabiamy.pl

Matematyka
 -  liceum

Matematyka
 -  liceum

Ze zbioru liczb {0, 1, 2, 3, ..., 2n} losujemy kolejno trzy liczby bez zwracania i sumujemy je. Oblicz liczbę elementów tego zbioru, wiedząc, że

...

Magda
19434
odpowiedziała na to pytanie

Zauważmy, że wszystkich liczb w zbiorze {0,1,2,..., 2n} jest  

W tym zbiorze jest   liczb parzystych oraz   liczb nieparzystych.

Zał:  

Zatem:

 

A - wylosowano trzy liczby, których suma jest liczbą nieparzystą (wylosowano dwie liczby parzyste i liczbę nieparzystą lub trzy liczby nieparzyste)

 

 

 

 

 

 

Z treści zadania wiemy, że:

 

Zatem:

 

 

 

 

 

 

 

 

Wideolekcja
content
2 kwietnia 2019
Język angielski

Uzupełnij z podanych w nawiasie lub zgadnij według tekstu kim jest.

- Jane only started working here two months ago and she already ......... an unusually high salary for her position. (earns / is/takes )
- Students who work in bars and restaurants usually ........... low wages – around £6 per hour. ( earn/take/do)
- After a long week at my desk, I often want to ..................... some physical work and so I do the gardening at weekends (do/earn/take)
- This person has studied medicine and knows a lot about health
- This person is a member of a local or national government
- Most of my friends are musicians and they .......... self– employed (do/are/work)
- This person's job is to show new trends at a fashion show.
- Jeff, could I ............ a day off tomorrow? I'd like to go on a trip with my family ( take/earn/go)
- As an employee here, you can ............. four weeks of paid holiday every year. ( be/take/work)
- This person appears in films and on stage
- This person teaches you something practical (e.g. driving) or a sport.
- This person can repair a sink or a toilet
- This person will cut your hair and make it look attractive
- The condition of the company is really bad, so no one expects to .............. a pay rise soon. (be/get/take)
- This person welcomes hotel guests and gives them a key to their room
- This person can construct or repair buildings
- Please be quiet – Dad's sleeping. He ........... shifts and he's just got home. (takes/works/earns)
- In this department we all .......... flexible hours. You can get to work between 8 and 10 o'clock. (earn/take/work)
- This person looks after passengers' comfort on a plane.
- I believe that only people who .............. well-paid can work efficiently and feel motivated (take/are/work)

 

 

około 22 godziny temu
Wideolekcja
content
29 marca 2019
Wideolekcja
content
2 kwietnia 2019
Język angielski

Reported speech-

Jerry, why don’t you stay with us for a few more days,” said Neil. (SUGGESTED)
……………………………………………………………………………………………………………………………………………………......................

2. “It was a bad idea to invest so much money in that shop,” said Florence. (REGRETTED)
……………………………………………………………………………………………………………………………………………………......................

3. “Ben, it was you who forgot to lock the door!” said Simon. (ACCUSED)
……………………………………………………………………………………………………………………………………………………......................

4. “Phil, you should move your money to a different bank,” said Dora. (ADVISED)
…………………………………………………………………...………………………………………………………………………………......................

5. “I will not keep the place for you till September,” said Clara to Adam. (REFUSED)
…………………………………………………………………...………………………………………………………………………………......................

6. “I heard you have passed your A- levels, Rose. Well-done!” said Lynn. (CONGRATULATE)
………………………………………………………………………………………………………………………………………….……………………………..

7. “You must visit us next summer,” said Pam to me. (INSISTED)
………………………………………………………………………………………………………………………………………….……………………………..

8. “I did not inform the press about the stolen money,” said Paul. (DENIED)
………………………………………………………………………………………………………………………………………….……………………………..

9. “You have made incredible progress as an artist,’ said Jenny to me. (COMPLIMENTED)
………………………………………………………………………………………………………………………………………….……………………………..

10. “Yes, I was the one who put this controversial photo in the hall,” said Derek. (ADMITTED)
………………………………………………………………………………………………………………………………………….……………………………..

1 dzień temu