SOLUTION: <b>MUST SOLVE USING PERMUTATIONS</b> On a bookshelf there are 9 books. In how many ways can you select 4 books to read in order? I would greatly appreciate your assistance w

Algebra ->  Probability-and-statistics -> SOLUTION: <b>MUST SOLVE USING PERMUTATIONS</b> On a bookshelf there are 9 books. In how many ways can you select 4 books to read in order? I would greatly appreciate your assistance w      Log On


   

Question 34907: MUST SOLVE USING PERMUTATIONS
On a bookshelf there are 9 books. In how many ways can you select 4 books to read in order?
I would greatly appreciate your assistance with this problem.
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Choosing 4 books out of nine can be expressed by:
nPr+=+n%21%2F%28n-r%29%21 where n = 9 and r = 4
9P4+=+9%21%2F%289-4%29%21=9%21%2F5%21+=+3024