Question 408947
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12 ways to choose the first book,


For each of these 12 ways there are 11 ways to choose the second book.  121 ways.


For each of these 121 ways there are 10 ways to choose the third book.  1210 ways.


And so on:



*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 12\ \times\ 11\ \times\ 10\ \times\ \cdots\ \times\ 3\ \times\ 2\ \times\ 1\ =\ 12!]


You can do your own calculator work.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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