In 1,307,674,368,000, or 15! ways.
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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.
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