5040
7 factorial, or 5,040.
4 x 3 x 2 different ways, ie 24
The number of ways that 15 books can be arranged on a shelf is the same as the number of permutations of 15 things taken 15 at a time. This is 15 factorial, or 15!, and is 1,307,674,368,000.
There are 2*5! = 240 ways.
5040
7 factorial, or 5,040.
4 x 3 x 2 different ways, ie 24
The number of ways that 15 books can be arranged on a shelf is the same as the number of permutations of 15 things taken 15 at a time. This is 15 factorial, or 15!, and is 1,307,674,368,000.
There are 2*5! = 240 ways.
The number of permutations of five things taken five at a time is five factorial, or 120.
it depends on the shelf of course
One row of 5 different brands with each type being represented can be arranged in 5x4x3x2x1= 120 ways
6! = 1 x 2 x 3 x 4 x 5 x 6.
120. You do 5*4*3*2*1=120. you multiply the number that you are given for example how many times can books 3 be arranged on a shelf you multiply 3*2*1=6 that is your answer
6 x 5 x 4 x 3 x 2 x 1 = 720 ways
5*4*3*2*1=120 ways