15
3 x 5
10 + 5
30 / 2
XV
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Fifteen or 15.0 or 15/1
As a product of its prime factors it is: 3*5 = 15 Or as: 1*15 = 15
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.
To write the numbers 168 thousand 15 hundreds into a number, it would be 169,500. There is another ways to write it depending on if you want decimals, 168,00.15.
There are many ways, but 5 different ways are: 3/1, 6/2, 9/3, 12/4, and 15/5.