六个人的帽子打乱了顺序,随即各取一个帽子,求都不是自己的帽子的概率?n个呢.

解题思路：利用间接法，先求出六个人排成一排情形，减去甲乙相邻情形即可．

六个人排成一排，共有
A66种方法，
其中甲乙相邻，共有
A55
A22种方法，
∴甲、乙两人之间至少有一个人的排法种数为
A66−
A55
A22=480．
故答案为：480．

点评：
本题考点： 计数原理的应用．

考点点评： 间接法是解决排列、组合的常用方法．

D

排列组合问题 要分类讨论
1、A在第一位 5*4*3*2*1
2、A在第二位 计算原理同上
3、A在第三位
4、A在第四位
5、A在第五位
A不可能到第六位 不然A就在B后了
同理 后边继续分各种类 分别计算 比较麻烦

N:In a dark dirty house,there lived a small,dirty salesman.He always makes unhealthy candies and sells them to the students.He has a lot of money now.But how does he make the candies?Oh,xu …… He is coming!
S:Hello,do you know me?No?Oh,let me tell you .I’m the famous candy salesman at the school gate.My candies are very popular,(展示),I don’t know why.The foolish students always come here.I’ll be a boss soon!Candy,money,candy,money……
Oops!It’s time to make candies now.(看表)
First,put the flour on the table.
Then,water,sugar,flour.(边说边做)
Now press,press……
Oh,my dirty hands!Never mind!Just do it!(满不在意的神情)
Press,press……
Oh,my god!Never mind!Just do it!
Press,press,the children will not know it ,it’s OK,hehehe……
Now let me cut it into pieces!

1、1分钟
2、1+2=3分钟
3、1+2+3=6分钟
4、1+2+3+4=10分钟
5、1+2+3+4+5=15分钟
6、1+2+3+4+5+6=21分钟 一共需要1+3+6+10+15+21=56分钟

C(m,n)表示n个里取m个
C(2,6)*3*3=135
!

请您看
这是很经典的一道题啊.
要用染色的话,认识连红,不认识连蓝.
任选一个人,他和其他5人有一种颜色至少有三条,假设是红,并与ABC相连.
如果没有红色三角,那么ABC相互之间不能连红色.但是这样ABC就是蓝色三角形.
结论：至少有一个三边同色三角形.

甯屾湜閲囩撼.
Friendship Beyond Everything
Cash:Rita's boyfriend
Rita:A suspicious girl
Rita,May and Mary are roommates
Mr.Wang
Narrator
Narrator:Cash and Rita are a nice couple,but they are separated from each other in different colleges after entering the same university.Because Mary and Cash are in the same class and both like sports,especially roller-skating,they often go skating together and they soon become good friends.Besides Rita didn't tell her roommates Cash is her boyfriend.
SCENE I
Narrator:One day Cash calls Mary to play roller skating,and he wants to introduce his girl friend to her.
Mary:Hello!
Cash:Hey Mary,what are you doing?And do you want to go skating with me?
Mary:That is exactly what I am thinking.We will meet at the Activity center.
Cash:Ok,see you.
Mary:See you.
(He puts down the phone and calls Rita.)
Cash:Dear,I want to skate.Can you keep company with me?
Rita:No,I am busy writing papers.Tomorrow is the deadline for handing it in.I will go there as soon as I finish it.
Cash:Ok!Bye bye.
SCENE II
(The Activity center)
Mary:Here,Cash.
Cash:Sorry,I'm late.let's go.
(After several minutes)
Mary:It's too hot,let's take a break.
Cash:Yeah!
Mary:I remember that you told me you would show me your girlfriend this week.
Cash:Oh!She will be here soon.
Mary:She must be beautiful,you love her very much.
Cash:Yes,she is a good girl,I will cherish her.
Narrator:And they start to play again hand in hand.After Rita finishes her paper,she comes to the Activity center and sees them playing hand in hand happily.Then she goes back.
SCENE III
Narrator:Rita and Mary are in the dorm,and May comes in suddenly.
May:I have good news to tell you,school will hold the drawing contest.You two have a gift in drawing.I think it is a chance for you.
Mary:Really?What is the topic?
May:It isn't limited,you can choose whatever you like,then hand it in to Mr.Wang a week later,it will be assessed by professors.
Mary:I will take part in,and how about you,Rita?
Rita:It is none of your business.
May:What are you talking about?
Rita:Sorry,I am just tired.
SCENE IV
Narrator:Mary and Rita are in the dorm again.
Mary:I have finished my drawing,but I have no time to hand it in,can you help me?
Rita:Ok!
Narrator:The scene Cash and Mary playing roller skating comes into her mind.She makes a decision that she hides Mary's drawing in her book.
Mr.Wang:Come in!
Rita:Excuse me,Mr.Wang,this is my drawing.
Mr.Wang:Put it on the desk and sign on the name list.
Narrator:A week later,they are happy to know Rita wins the second prize.But to their surprise,Mary fails.Mary is so disappointed,because she is confident in her drawing all the time.She wants to find the teacher to figure it out.
Mr.Wang:Come in
Mary:Mr.Wang,I want to know whether you have made it wrong,I have confidence in my drawing,but I did not see my name on the list of winners.
Mr.Wang:What is your name and when did you hand it in?
Mary:Mary,on Monday last week.
Mr.Wang:Sorry,your name isn't on the name list.You must forget to hand it in.
SCENE V
Narrator:Rita and May are in the classroom
May:I am glad to hear the news,but Marry must be disappointed.She is so self-confident,but the result is opposite.We should comfort her.
Rita:I think only self-confidence isn't enough.She is too self-confident.I believe the contest is fair.
Narrator:Rita takes a book out from the bag,and a paper slippes out.May picks up the paper.
May:what is this?It鈥檚 Mary's drawing.You didn't hand in it to Mr.Wang,right?
Rita:Why should I hand in it?It鈥檚 her job,not mine.
Narrator:At that time,Mary comes into the classroom and hears that.
Mary:Why?Why did you do it like this?I am ashamed of having a friend like you.You don't deserve the friendship.
Rita:You deserve it.I have seen you playing roller skating with my boyfriend hand in hand.So disgusting,isn鈥檛 it?
Mary:Your boyfriend?Cash?You must misunderstand.We are just good friends.I didn't know you are his girlfriend.He told me he loves his girlfriend very much and takes her as his apple.
Rita:Enough!I don't want to listen any more.
Narrator:She runs away,and Cash witnesses all at the gate.He runs after her.
SCENE VI
Cash:Wait,Rita,wait!Don't blame yourself,it is all my fault.But you should believe me.You are my only lover.I was going to introduce you to each other.I don't know everything goes to the opposite side.
Rita:You don't know?Well then who knows?Why don't you tell me you are good friends?You know I love you so much,and I shouldn't suspect you,but at that time,I thought nothing but hate.
Cash:Sorry,dear,forgive me!
Rita:Who forgives me?I hurt Mary deeply,now she must hate me very much,what can I do?
Narrator:Mary comes.
Mary:I was angry .but if there are two choices- the prize and the friendship,I will choose the latter.
Rita:Sorry,Mary,it was quite without intention.
Mary:I know,I know,I also should say sorry to you,I couldn't control my temper.Forget it .We are still good friends,OK?
Rita:Ok,thank you,Mary.
Narrator:Then Rita and Mary embrace each other tightly.

p1 p2 p3 p4 p5 p6
p1:don't wait.come now. buy this pair of shoes. they are very cheaP不要等待。马上过来。来买这双鞋。它们很便宜。
p4 p5 p6:how much are they?他们多少钱
p1 :20yuan.20元
p4 p5 p6:they are so cheap . they are must very bad and uncomfortable.他们太便宜了，他们一定质量差又不舒服
p2:go go go.going to buy shoes.come come come .coming here to buy shoes.去去去，去买鞋。来来来。来这里买鞋。
p4 p5 p6:why do we come here to buy shoes?我们为什么要来你这里买鞋？
p2:because my shoes are very good and special.因为我的鞋很棒又特别
p45 p5 p6:how much are they ?他们多少钱
p2:100yuan100元
p4 p5p p6:oh this is a good idea to buy these shoes.
卖这些鞋是个好主意
p3:don't go to p1's store.don't go to p2's store.
if you want to buy shoes.you must go to p3'store.
不要去p的店 也不要去 p2的店。你如果想买些就来 p3的店

Rise up and motivated group
Slogan: have a heart of progress, in order to be successful! Where to fall, up from there!
奋起上进组
口号：拥有一颗上进的心,才能取得成功!从哪里摔倒,就从哪里爬起来!
Day day up group
Slogan: honor from the efforts, progress comes from diligence! Believe yourself, never give up! A little progress every day, days and months multiplyingstride stride!
天天向上组
口号：荣誉来自努力,进步来自勤奋!相信自己,永不言弃!每天进步一小步,日积月累跨大步!

获得第六名的同学的分数=89.5×6-5×91=82分

。。

4n+2人 当n=1,X=4*1+2=6 当n=2,X=4*2+2=10 当n=3,X=4*3+2=14 以此类推 第n张桌子做4n+2人

我有一个美好的家庭,一共六个人.我的爷爷、奶奶、爸爸、妈妈、叔叔和我.爷爷曾经是名经理,奶奶曾经是名会计.爸爸是名副经理,妈妈是经理.哦,我家的经理真多啊!呵呵,我的叔叔是名售楼员.而我——Mary,就是一名中学生啦.我喜欢这个热闹的家
I have a wonderful family, a total of six people. My grandfather, grandmother, father, mother, uncle and I. Grandpa had is a manager, grandma was accountant. Dad is a deputy manager, my mother is a manager. Oh, my manager really much! Ha ha, my uncle is a sales team. And I--Mary, is a high school student! I like this lively home
亲啊,这是在有道翻译的,希望对你有帮助哦

因为“至少有三个人,他们要么互相都认识,要么互相都不认识."这句话包含了所有的情况
如果6个人都不相互认识,那么6>3,符合至少三个都不认识的
如果2两个人相互认识,那么4个人相互不认识,符合至少三个都不认识的
如果3个互相认识,符合至少3个相互认识的
如果4个或5个或6个相互认识,都是符合至少3个互相认识的

a:may i help you b:yes,i want to look for a pair of fitting shoes.a:there are many styles and colors ,the red one is selling well.it is beautiful for you wearing.you can have a try.b:ok,let me have try.c:yes,it looks cute,can you give me another pair to trying.a:that's right.d:i don't want to buy anything,i just go around for a watch.e:hello three.it's suprise to stumble across to you.f:hello !f:we just have bought some dayly necesseris.e:oh!a good looking shoes,b.It is more fit for you than others ..

校 如果有帮到您 请给予好评 如果还有问题 请重新提问哦 谢谢拉#^_^#祝您愉快

"A total of six people on Saturday morning at 8:30 to Station Square

Five people wandering in shopping places.
Jenny:well,let's buy what good?
Small wood:Jenny,let's buy some cookies,just the promotion!
Jenny and small wood to buy cookies.
Aside of the ya-ya talked:can't do this,I also want to eat candy !
LiuLiu:yes by the way,how much is the sweets?
Ya deer:candy?Maybe it is ten yuan?Salesman,how much is the sweets?
Salesman said laughingly:7 yuan.
Yy:it's too cheap?Buy the candy.
Jenny:one yuan qu wizards!Cookies!
A few people in discord.
五个人在购物场所徘徊着.
珍妮：哎呀,咱们买什么好呢?
小木：珍妮,咱们就买那些曲奇吧,正好促销呢!
珍妮和小木决定买曲奇.
一旁的丫丫说话了：这可不行,我还要吃糖果呢~!
柳柳：就是嘛~对了,糖果多少钱?
雅鹿：糖果?或许是10元吧?售货员,糖果多少钱?
售货员笑盈盈地说：7元.
丫丫：这也太便宜了吧?买糖果.
珍妮：曲奇才1元呢!曲奇!
几个人不欢而散.

按三角型排列,从上到下为一、二、三,这样从三个方向看就是三排,每排三人了.

The doctor has saved six lives.

Moving forward with we six,六人齐头并进,一起前进都可以翻译

第一步 ：两小孩过 第二步：一小孩回来后再和另一个孩子过 第三步：回来一个小孩之后让另外两个孩子的家长一起过
第四步：对岸的四人中回来爷俩 第五步 ：河这岸的两个大人过去,第六步：之后让对岸的孩子依次把这边的两个孩子接过去即可 本人可能语言表达能力差些,望谅解 .不过我相信聪明人会看的明白分析透彻的.

一马当先.

无污染,】
排列组合中的排列+概率
有编号的6个人不同排列
共有：A(6,6)种【排列】
其中任何一个人座对位置
概率为：1/6【概率】
综上所述：
有且只有两个人的编号一致的坐法
有：A(6,6)/36=20种

有区别啊
一个十分之一,一个四分之一

乙与己相隔一人,并坐在乙的右面,这句话矛盾嘛

四个桌子拼成一排最多做150人,如果拼成大正方形是120人.拼成一排座的人最多.

The fourth Thursday in November is called Thanksgiving Day. In the United States, it is an annual (每年的) occasion to show thanks to God for his goodness.
As a historical, national and religious...

如果本次讲座只有四五六年级和老是参加,那么总人数应该为48人 1/2*X + 1/6*X + 1/4*X + 4=X X=48

第一种用捆绑法,A55为120,第二种全排列除以三的阶乘,第三种也是全排列除以四的阶乘,第四种
A66/（A22*A22）

排队顺序
1分 2分 3分 4分 5分 6分 的人依次排队打水
等待时间是：0+1+3+6+10+15=35
打水时间是：1+2+3+4+5 +6=21
总时间是：35+21=42

其中3个对半分,另外2个切成1/3,
每个人拿半个加1/3个,那么就刚好了
即1/2+1/3=5/6

此题分以下步骤进行.
步骤一：将6个人的座位排好,有6!种排法.
步骤二：将4个空座位插入人中间,共有7个位置可以插入.分以下几种情况：
（1）4个凳子都不相邻,有7C4种排法；
（2）4个凳子有2个相邻,且剩余2个不相邻.将相邻的2个凳子当成1个凳子插入,
于是有7C3种排法,而2个凳子与1个凳子不同,因此还要在这3个位置中在排2
个凳子的位置,有3种排法,故有3×7C3种排法；
（3）4个凳子每2个都相邻.与（2）中方法相同,有7C2种排法.
有加法原理、乘法原理得
共有6!×（7C4+3×7C3+7C2）=115920
我觉得答案有问题.

不是27：6吗

因为已知道c的妹妹是小红,从第二盘判断,c和小丽对a和b的妹妹,因为只有三个女的,小红是不可能的,剩下的小兰就是b的妹妹,从而得出a的妹妹是小丽.

P6 6 -2 *P5 5
6个人排队是P6 6共720种
甲站最左边和最右边的方法都是P5 5,即2个P5 5
所以是720-120-120=480

C（3,2）/C（6,2）=3/15=1/5

(5C1)/(6C2)=1/3

奥数模635

最后肯定在六边形中心相遇,时间是2a/v,每个人走过的路程是2a.
具体解法在附件中,两种方法从本质上上求得一般性.

饿,let me think ^^

无任何要求6人4房,①=4^6=40966人4房3间空着,②=C（4,1）=46人4房2间空着,③=C（4,2）×【6人2房无空房】 其中【6人2房无空房】=6人2房－6人2房1空房=2^6－C（2,1）=64－2=62 ③=3726人4房1间空着,④=C（4,3）×【6人3房无空房】 其中【6人3房无空房】=6人3房-【6人3房1空房】－【6人3房2空房】=3^6－C（3,2）×【2^6－C(2,1)】－C（3,1） =729－186－3=540④= 4×540=2160最后=①－②－③－④=4096-4-372-2160=1560这法一般人都能理解也许

设甲乙外4人为1234 ,一种甲12 乙34. 第二种甲13 乙24第三种甲14 乙23 第四种甲23 乙14 第五甲24 乙13 第六甲34 乙12

5984个人

指的是所有人的排队时间和打水时间的总和吗?
我想的是,①一分钟.然后倒给需要六分钟的 六个人都要等一分钟.6*1
②两分钟,然后倒给需要五分钟的.少了一个人了,五个人都要等2分钟 5*2
③三分钟,然后倒给需要四分钟的.少了两个人了,四个人都要等3分钟 4*3
④然后剩下的三个人,再排列一次.一分钟,两分钟,三分钟.
三个人要等1分钟,两个人等两分钟,一个人自己等3分钟.
排队时间是6*1+5*2+3*4+3*1+2*2+3=38

这个题目看上去复杂,所以可以先改变一下题目.我们假设向这堆苹果里面再添一个苹果,那么这堆苹果(n +1个)现在就可以正好被二人,三人.十人所平分.所以我们先这样算,求出2,3,……10的最小公倍数,然后用这个数减一,看看能不能被11整除,如果可以就是所求的答案,如果不能,就把这个公倍数乘以二,再减一去试试能不能整除11,一直到能够整除为止.具体数据因为现在没纸每笔,可能不能立刻给你答案,所以说了个解题方法

短文开始一连用六个排比,举出事实说明这些人虽出身贫贱,但他们在经受了艰苦磨练之后,终于成就了不平凡的事业.顺此事实,作者连用几个短语得出“天将降大任于是人也”的结论,让人不能不信服.