1) In how many ways can a group of 4 men and 2 women be chosen from a total of 7 men and 5 women?
350
2) A team of 3 students is to be formed from a class of 25 students.
How many ways are there to form this team if there is 1 team leader, 1 scribe and 1 timekeeper in the team? Each person can only perform one role at a time.
13800
3) Six letters (A, B, C, D, E, F) are randomly arranged in a line. The letters A and E, have to be placed next to each other.
a)How many different arrangements are there?
240 b)What is the probability that the letters A and E are placed next to each? 1/3

Question

1) In how many ways can a group of 4 men and 2 women be chosen from a total of 7 men and 5 women?
350
2) A team of 3 students is to be formed from a class of 25 students. 
How many ways are there to form this team if there is 1 team leader, 1 scribe and 1 timekeeper in the team? Each person can only perform one role at a time.
13800
3) Six letters (A, B, C, D, E, F) are randomly arranged in a line. The letters A and E, have to be placed next to each other.
a)How many different arrangements are there?
240 b)What is the probability that the letters A and E are placed next to each? 1/3

anonymous · Answer

A student has 3 comic books and 4 story books.

a) How many ways can he arrange the 3 comic books on his book shelf? 

Ans:  6
b) How many ways can he arrange the 4 story books on his book shelf?

Ans:  24

c) If he is to arrange the 7 books on the same shelf but he has to ensure that all the comic books and the story books are to be grouped together, how many ways can he arrange the books?

Ans: 288

anonymous · Answer

Anyone help me check whether are all my answer correct? (:

ganeshie8 · Answer

please limit to one question per post

anonymous · Answer

Sorry~

anonymous · Answer

But I need to know which is correct or wrong :/

ganeshie8 · Answer

All correct ! good job !!