24 different ways. For each of the four possible first spots, there are three possible second spots, two possible third spots, and then the last spot is the one left over. So there are 4! (four factorial) possible arrangements.
There are 13!/(6!(13-6)!) = 1716 ways to distribute six different books among 13 children if no child gets more than one book.
1 5 x 14 x 13 x 12 x 11 = 360,360 ways
13 books
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.
There are 13 books. Book 13 is about regular solids.
13 books
There are 13 books in the Daughters of the Moon series by Lynne Ewing.
There are three ways, pretend 13 to 13 or 13:13 or 13 slash under it and a thirteen under that.
There are 13 books in Euclid's Elements.
There are 13 books. Book 13 is about regular solids.
13 books in total, Book 13 is about Regular solids.
13 of them.