arrange book's question

[neworld222]

there's 10 books ,apoint 5 books of the 10 books,now you need put 10 books on one line.
question: Probability of appointed 5 books take together

 

[Deleted member 4993]

there's 10 books ,apoint 5 books of the 10 books,now you need put 10 books on one line.
question: Probability of appointed 5 books take together

Please tell us what does "appoint" mean in this context?

I am unfamiliar with that term.

 

[galactus]

I think they mean 'choose'.

Please clarify your problem. It's difficult to understand what you mean.

 

[neworld222]

I think they mean 'choose'.

Please clarify your problem. It's difficult to understand what you mean.

yes

 

[neworld222]

i change the question : probability of put 5 books together

 

[Deleted member 4993]

One way to do this would be to choose the five boks and keep those together. Now you have six slots and six "books".

You can arrange those in 6! way

You can arrange those five "chosen" books in 5! ways

Can you continue to finish ?

 

[stapel]

there's 10 books ,apoint 5 books of the 10 books,now you need put 10 books on one line.
question: Probability of appointed 5 books take together

The soul of mathematics is exactitude, which could explain the difficulties we're having here...? :shock:

I will guess that English is not your first language, and that you have attempted to translate this exercise from whatever was its original language. I think you mean the following:

From ten books, five are chosen. The ten books are to be placed in a row on a shelf. Find the probability that the five chosen books will end up standing together, side by side, on that shelf.

Please confirm or correct. (If the text needs to be corrected, please try to have a English-fluent friend help you out.)

Thank you!

Eliz.

 

[neworld222]

One way to do this would be to choose the five boks and keep those together. Now you have six slots and six "books".

You can arrange those in 6! way

You can arrange those five "chosen" books in 5! ways

Can you continue to finish ?

i got it ,thx

 

[Deleted member 4993]

i got it ,thx

It will be useful if you could post your work and answer and we could review it.

 

[neworld222]

there's 10 books ,apoint 5 books of the 10 books,now you need put 10 books on one line.
question: Probability of appointed 5 books take together

The soul of mathematics is exactitude, which could explain the difficulties we're having here...? :shock:

I will guess that English is not your first language, and that you have attempted to translate this exercise from whatever was its original language. I think you mean the following:

From ten books, five are chosen. The ten books are to be placed in a row on a shelf. Find the probability that the five chosen books will end up standing together, side by side, on that shelf.

Please confirm or correct. (If the text needs to be corrected, please try to have a English-fluent friend help you out.)

Thank you!

Eliz.

thx,your expained is exactitude.English is not my first language,i'm Chinese.thanks a lot.

 

[neworld222]

i got it ,thx

It will be useful if you could post your work and answer and we could review it.

i got result,it's (6!*5!)/(10!)=1/42.
you're a good man

 

[Deleted member 4993]

i got result,it's (6!*5!)/(10!)=1/42. ....Correct

 

[neworld222]

i got result,it's (6!*5!)/(10!)=1/42. ....Correct

and what's your answer?

 

[stapel]

i got result,it's (6!*5!)/(10!)=1/42.

....Correct

and what's your answer?

Probably the same as yours, since he said that your answer was correct. :wink:

Eliz.