A) What's the probability that between the books "Cinderella" and "The Hobbit" 3 books exactly will seperate them?

I tried to do 9!*4!*2! divided by 10!

But..the answer doesn't make sense, that's 480%! :shakehead

Help?

B) Among the 10 books, 4 have red covers, 4 with blue and 2 with white. What's the probability that all books from the same colour are next to each other?

Here I tried to do 3!*4!*4*2! = 6912

Then 3! = 6 (because the order of what colours doesn't matter)

then 6912*6 = 41472

Then 41472 divided by 10! (which is all possible arrangements) I get = 0.011

Makes sense?

-nerd_girl (AKA April)