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The number of ways is : \(\frac{9\cdot8\cdot7\cdot6\cdot5}{120}=126\) ( ways )

Ans:126 ways 

2 tháng 2 2017

hay giup do minh chut nha

2 tháng 2 2017

36 dung khong

Read the text, and answer the questions                        The Royal Ballet School, LondonThere are only 25 places for the new students every school year. Students are from 11 to 16 years old, and there are boys and girls. It''s a bording school.On weekdays, there are four hours of lessons and two hours of ballets.In th evening, they watch TV at school. At the weekends, there are dance classes on Saturday mornings, and then they are free with their friends at school  1. How old are...
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Read the text, and answer the questions

                        The Royal Ballet School, London

There are only 25 places for the new students every school year. Students are from 11 to 16 years old, and there are boys and girls. It''s a bording school.

On weekdays, there are four hours of lessons and two hours of ballets.In th evening, they watch TV at school. At the weekends, there are dance classes on Saturday mornings, and then they are free with their friends at school

 

 

1. How old are students ?

.......................................................

2. Are there 25 students at the school ?

.......................................................

3. Are they only boys at school ?

.........................................................

4. How many hours of lessons are there on weekday ?

.........................................................

5. How about hours of ballets ?

............................................

6.Are there dance classes on Saturdays ?

...................................................

7. Are the students free on Sundy ?

......................................

8. Are there at home in the evening ?

0
8 tháng 11 2017

1 Ba doesn't get up at six o'clock every morning.

2 How many classrooms are there in his school?

3 How do you spell this word, Minh?

4 Stand up and open your book.

5 I am twenty-one years old and i'm a student

7 Is your house opposite the stadium?

8 There is a museum to the right of the house

9 In the neighborhood, there is a hospital and a factory.

10 Our class is on the third floor.

11 Nhung's house has six rooms

12 What time does your brother get up ?

Còn câu 6 mình thấy đúng mà!

Since when these 2 near each other ( 1 is outermost ) we can simply into the problem for P and Q arrange in a row, and since there are 2 outermost ones so we need to multiply by 2. So when P or Q is at one of any outermost ones, there are : 2! * 2 = 4 ( ways ).

Here, all arangement must count once. So after that, we don't worrry about the second outermost ones because we reduce to the simpler problem. And we do this until there is 1 left ( just work for the odd ones ).

So if n is the number of objects, the formula for this is \(n!-4\left[\frac{\left(n-1\right)}{2}\right]\).

Apply n = 7; we have \(n!-4\left[\frac{\left(n-1\right)}{2}\right]=7!-4\left[\frac{\left(7-1\right)}{2}\right]=5028\)

Ans: 5028 ways 

Question 1:The perimeter of the circle is cm(Write your answer by decimal in the simplest form)Question 2:Calculate: 626.35+525.36 =Question 3:Calculate:(Write your answer in the simplest form)Question 4:There are 60 seats on a train. 40% of the seats are empty. How many empty seats are there in the train?Answer: There are empty seats.Question 5:A car traveled at a constant speed for 5 hours, covering a total distance of 301km. How far did the car travel for one hour?(Write your answer by...
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Question 1:

The perimeter of the circle is cm
(Write your answer by decimal in the simplest form)

Question 2:
Calculate: 626.35+525.36 =

Question 3:
Calculate:
(Write your answer in the simplest form)

Question 4:
There are 60 seats on a train. 40% of the seats are empty. How many empty seats are there in the train?
Answer: There are empty seats.

Question 5:
A car traveled at a constant speed for 5 hours, covering a total distance of 301km. How far did the car travel for one hour?
(Write your answer by decimal in simplest form)
Answer:

Question 6:

The value of m is

Question 7:
Mrs. Jane buys 10kg of flour. She uses 1/6 of it to make a cake and 1/3 of it to make grape pies. How many kilograms of flour are left?
Answer: kg.

Question 8:
45% of M is 72. The value of M is

Question 9:
Emily rides her horse 21km in 7/6 hours. What is her average speed in kilometers per hour?

Answer: Her average speed is kilometers per hour.

Question 10:
Anna multiply together the following numbers

How many zeros are there at the end of the product?
 Answer: There are zeros.

0
2 tháng 12 2015

chỗ này không phải học tiến anh đâu nhà con lợn

2 tháng 12 2015

có học vào thông tin mà xem nha

13 tháng 5 2016

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