Answer: There are 30 different combinations if the order in which the books were chosen counts, so a set of book A and book B is considered different from a set of book B and book A.There are 15 different combinations if it does not matter in which order the books were chosen, so a set of book A and book B is considered the same as a set of book B and book A.
Answer: Cost varies hugely by the fact if an item is required or for amusement purposes. Education books are a requirement and students have no choice but to buy them. Book making companies see this as a easy way to make money. Closest example to education books would be gasoline.
Answer: To figure out which dental position someone wants to make a careerit is best to study different area of the profession. During dentalschool they will allow students to try multiple types and help themfigure out what works best for them.
Answer: There are a few different specialty television channels devoted to football depending on the cable provider you use. On Comcast Xfinity cable, the NFL Network and Redzone are specialty football channels.
Answer: Any book that a 13 year old wants to read - not something boring, but not something too easy to read. 13 year olds love magazines, but are good with books such as: The Sisterhood of the traveling pants Or Scorpians ... something like adventerous or fun to read!