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To arrange 3 algebra books and 3 geometry books on a shelf so that no two books of the same type are next to each other, you can use the concept of permutations. There are 3! ways to arrange the algebra books and 3! ways to arrange the geometry books. This gives a total of 3! * 3! = 36 ways to arrange the books on the shelf such that no two books of the same type are next to each other.
He wrote 13 books in Alexandria making theorems for Geometry
Children's Books are sometimes called "beginner books" or "beginner readers" or something similar.
The books that are not included in the Bible are generally called the apocrypha and the pseudepigrapha.
They're called books of the bible.