Contents

- 1 Kinh Nghiệm Hướng dẫn How many ways can we select 6 people out of 10 of which a particular person is not included? Chi Tiết
- 2 Related Probability Q.&A
- 2.1 How many ways are there to select six players from a 10 thành viên tennis team to make a trip to a match another school?
- 2.2 How many ways can 5 people be selected 10?
- 2.3 How many ways can you select 4 people from a group of 10?
- 2.4 How many ways can you select 5 people out of 7 people?
- 2.5 Video How many ways can we select 6 people out of 10 of which a particular person is not included? ?
- 2.6 Share Link Tải How many ways can we select 6 people out of 10 of which a particular person is not included? miễn phí

## Kinh Nghiệm Hướng dẫn How many ways can we select 6 people out of 10 of which a particular person is not included? Chi Tiết

Bạn đang tìm kiếm từ khóa How many ways can we select 6 people out of 10 of which a particular person is not included? được Update vào lúc : 2022-09-21 06:59:36 . Với phương châm chia sẻ Thủ Thuật Hướng dẫn trong nội dung bài viết một cách Chi Tiết 2022. Nếu sau khi Read tài liệu vẫn ko hiểu thì hoàn toàn có thể lại phản hồi ở cuối bài để Tác giả lý giải và hướng dẫn lại nha.

This section covers permutations and combinations.

Nội dung chính

- Related Probability Q.&AHow many ways are there to select six players from a 10 thành viên tennis team to make a trip to a match another school?How many ways can 5 people be selected 10?How many ways can you select 4 people from a group of 10?How many ways can you select 5 people out of 7 people?

**Arranging Objects**

The number of ways of arranging n unlike objects in a line is n! (pronounced ‘n factorial’). n! = n × (n – 1) × (n – 2) ×…× 3 × 2 × 1

**Example**

How many different ways can the letters P, Q., R, S be arranged?

The answer is 4! = 24.

This is because there are four spaces to be filled: _, _, _, _

The first space can be filled by any

one of the four letters. The second space can be filled by any of the remaining 3 letters. The third space can be filled by any of the 2 remaining letters and the final space must be filled by the one remaining letter. The total number of possible arrangements is therefore 4 × 3 × 2 × 1 = 4!

The number of ways of arranging n objects, of which p. of one type are alike, q of a second type are alike, r of a third type are alike, etc is:

n!

.

p.! q! r! …

**Example**

In how many ways can the letters in the word: STATISTICS be arranged?

There are 3 S’s, 2 I’s and 3 T’s in this word, therefore, the number of ways of arranging the letters are:

10!=50 400

3! 2! 3!

**Rings and Roundabouts**

- The number of ways of arranging n unlike objects in a ring when clockwise and anticlockwise arrangements are different is (n –

1)!

When clockwise and anti-clockwise arrangements are the same, the number of ways is ½ (n – 1)!

**Example**

Ten people go to a party. How many different ways can they be seated?

Anti-clockwise and clockwise arrangements are the same. Therefore, the total number of ways is ½ (10-1)! = 181 440

**Combinations**

The number of ways of selecting r objects from n unlike objects is:

**Example**

There are 10 balls in a bag numbered from 1 to 10. Three balls are selected random. How many different ways are there of selecting the three balls?

10C3 =10!=10 × 9 × 8= 120

3! (10 – 3)!3 × 2 × 1

**Permutations**

A

permutation is an ordered arrangement.

The number of ordered arrangements of r objects taken from n unlike objects is:

nPr = n! .

(n – r)!

**Example**

In the Match of the Day’s goal of the month competition, you had to pick the top 3 goals out of 10. Since the

order is important, it is the permutation formula which we use.

10P3 =10!

7!

= 720

There are therefore 720 different ways of picking the top three goals.

**Probability**

The above facts can be used to help solve problems in probability.

**Example**

In the National Lottery, 6 numbers are chosen from 49. You

win if the 6 balls you pick match the six balls selected by the machine. What is the probability of winning the National Lottery?

The number of ways of choosing 6 numbers from 49 is 49C6 = 13 983 816 .

Therefore the probability of winning the lottery is 1/13983816 = 0.000 000 071 5 (3sf), which is about a 1 in 14 million chance.

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### How many ways are there to select six players from a 10 thành viên tennis team to make a trip to a match another school?

C(10, 5) = 10! / 5! * 5! = 252.

### How many ways can 5 people be selected 10?

5! Therefore, the number of ways of selecting a committee of 5 members from a group of 10 persons is 252.

### How many ways can you select 4 people from a group of 10?

We are to determine the number of 4 thành viên committees that can be formed from 10 people. This is simple combination problem since order is not important here. So Number of ways = 10C4 = 210.

### How many ways can you select 5 people out of 7 people?

selecting 5 men out of 7 men and selecting 0 women out of 6 (third case). So his answer is C(7,3) * C(6,2) + C(7,4) * C(6,1) + C(7,5) * C(6,0) = 756.

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