Not exactly sure what you mean. There is 15 and fifteen
15
15
Any 12 from 15 in any order = 15 x 14 x 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 = 217,945,728,000 different ways! This seems ridiculously high but... The first space can be any one of fifteen, the second, any one of fourteen and so on until the twelfth can be any one of the remaining four.
(4 * 4) - (4/4) equals 15.
The number of different ways that you can arrange 15 different items is given by the permutations of 15 things taken 15 at a time. That is 15 factorial, or 1,307,674,368,000.
15
15C3 = 455
Assuming that the arrays need to be rectangular, the answer is 14,597,412,049,059,800,000 or approx 15 quintillion.
It depends on whether they are being arranged in a line or a circular pattern. In a line: 15*14*13 = 2730 ways. In a circular pattern : ABC, BCA and CAB will be the same pattern, only rotated. So the answer is 15*14*13/3 = 910 ways.
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.
Imagine putting them on a shelf from left to right. There are 16 ways to choose the first one. Then you have 15 left so there are 15 ways of choosing one of those to be next on the shelf. Then 13 ways, 12 ways and so on until you have only one trophy left to put on the right-hand side. That means there are 16 x 15 x 14 x 13....and so on ways. This is called "factorial 16" and is written down as 16! On many calculators there is a n! button which will calculate factorial "any whole number". In the present case you simply press the buttons for 16 first and then press the n! button, which will give you 1307674368000 So it would take you quite a while to arrange them in so many different ways.
15
Factorial 15, usually written as "15!"
There are 13 ways.
Not exactly sure what you mean. There is 15 and fifteen
Petticoat Junction - 1963 How to Arrange a Marriage 7-15 was released on: USA: 3 January 1970