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The number of ways to arrange nitems is n!, where "!" is the factorial function. The number of ways we can arrange the 12 books is therefore 12!. However, we don't really care what order the first 5 books are in, or what order the last 7 books are in, as long as they're the same books. We therefore divide by the number of ways to arrange 5 books and the number of ways to arrange 7 books.
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How many different sets of 2 books can be chosen from a set of 6 different books?
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.
How many different sets of four numbers can you get from six sets of numbers?
6 if order doesn't matter
How many paralel lines does a square have?
Two different sets.
Are books measured in grams or kilograms?
Single books in grams, sets of books in kilograms.
What is the value of a 1995 mint proof set?
To begin with, there are Mint sets and Proof sets, and they're 2 different things. You'll need to check your set to determine which kind you have. Mint sets are sets of uncirculated coins selected from normal strikes. These retail for about $15 to $20. Proof sets are specially-struck coins that have mirrorlike surfaces and matte-finish images. 1995 proof sets sell at a fairly decent premium - cupronickel sets retail for $35 to $45, and silver sets are in the $80 to $90 range.
