- Thread starter Felicia
- Start date

- Joined
- Jan 29, 2005

- Messages
- 8,319

Of courseA committee of 14 people consists of 4 boys, 5 girls and 5 other people are arranged in a row. Given that the boys are separated, find the probability of the girls are not all together

Could there be a committee of these people in which \(\displaystyle m=8~\&~f=6~?\) Well yes there could because \(\displaystyle m+f=14\) but there would be no way to separate all of the males; there are only six separators that create seven separate spaces.

Now a word about the phrase "

Let's take an example: \(\displaystyle m=6~\&~f=8\). If this example it takes five females to separate the six males

There are \(\displaystyle 14!= 87,178,291,200 \) ways to arrange fourteen people in a row.

There are \(\displaystyle (8!)\left(^9\mathcal{C}_6\right)(6!)=2438553600\) ways to arrange the committee so that no two of the six males are together.

Explanation: There are \(\displaystyle 8!\) ways to arrange the females who create nine places to separate the six males who can be arranged in \(\displaystyle 6!\) ways.

Thus if we are given six men and eight women to arrange in a row the probability that all the six men are separated is \(\displaystyle \frac{4}{143}\) SEE HERE

Now the downer: I have no idea how to work this question. It is so poorly put as to be unintelligible.

1) How is the committee chosen? Are the first 4 boys & 5 girls fixed?

2) Even if they are or are not, how is the makeup of the other five people determined?

3) Was the complete question given?

I hope someone reading this or the author of the O.P. can help us here.

- Joined
- Nov 12, 2017

- Messages
- 4,110

So you have some arrangement of BBBBGGGGGOOOOO. How many ways can they be arranged with no B's together? How many ways can they be arranged so that also GGGGG are all together? Where can you go from here?

There are several ways this could be tackled. In order to help as well as possible, we'll need to see what you have tried, and what you have learned. You did read our submission guidelines, didn't you?

- Joined
- Jan 29, 2005

- Messages
- 8,319

Well Prof. Peterson my initial reaction was "are you serious "?I'll suppose that the "other people" are adults (or something else that isn't boys or girls), not that they are neither male nor female, or that they are just not known. The problem certainly could be clearer.

So you have some arrangement of BBBBGGGGGOOOOO. How many ways can they be arranged with no B's together? How many ways can they be arranged so that also GGGGG are all together? Where can you go from here?

Well O.K. say that the \(\displaystyle O's\) are androgynous adults added to the given four boys and five girls (meaning prepubescent) children.

Now we have ten separators for the 'boys' so that can be done in \(\displaystyle (10!)\left(^{11}\mathcal{C}_4\right)(4!)=28740096000\) ways.

Last edited: