不用翻譯題目吧?
第一題：
a.可以重復(fù)：
(26+10)^6=36^6=2176782336
b.不可重復(fù)：
P(5,36)=36*35*34*33*32*31=1402410240
第二題：
P(4,16)=16*15*14*13=166530
第三題：
題目好像有點問題 應(yīng)該是these 2 positions吧?（一個總編和一個助理總編）,或者是還有10個小編一共12個?
按照2 positions來做就是
P(2,15)=15*14=210
第四題：
一共6個角色
a.P(6,6)=6!=720
b.9個試聽員聽6個角色,只要挑選6個試聽員還是可以多個試聽員聽同一個角色?感覺題目不是很明確.
按照可以多個試聽員聽同一個角色的話會很復(fù)雜,
如果只是挑選其中6人來試聽的話,就是
P(6,9)=9*8*7*6*5*4=60480
都是最簡單的排列題,能看懂題目就很容易了
答案我用計算器按的,可能會按錯=.=
1.To keep computer files secure,many programs require the user to enter a password.The shortest allowable passwords are
1.To keep computer files secure,many programs require the user to enter a password.The shortest allowable passwords are typically six characters long and can contain both numbers and letters .How many six-character passwords are possible if (a)characters can be repeated and (b) characters cannot be repeated?
2.A relay race has 4 runners who run different parts of the race.There are 16 students on your track team.In how many ways can your coach select students to compete in the race?
3.Your school yearbook has an editor-in-chief and an assistant editor-in-chief.The staff of the yearbook has 15 students.In how many ways can students be chosen for these 12 positions?
4.Auditions are being held for the play shown.How many ways can the roles be assigned if (a) 6 people audition and (b)9 people audition?看下面給的信息.
Parts available:
student A,student B,Principal,Teacher,Librarian,Coach
第1題和第4題有2個小問題,都要回答,
2.A relay race has 4 runners who run different parts of the race.There are 16 students on your track team.In how many ways can your coach select students to compete in the race?
3.Your school yearbook has an editor-in-chief and an assistant editor-in-chief.The staff of the yearbook has 15 students.In how many ways can students be chosen for these 12 positions?
4.Auditions are being held for the play shown.How many ways can the roles be assigned if (a) 6 people audition and (b)9 people audition?看下面給的信息.
Parts available:
student A,student B,Principal,Teacher,Librarian,Coach
第1題和第4題有2個小問題,都要回答,
英語人氣：467 ℃時間：2020-05-26 21:30:20
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