SOLUTION: Terry and Abigail are moving to a new house. They have 13 books on one shelf of their bookcase, but the narrow box Terry is packing can only hold a stack of 12 books. Abigail is c

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: Terry and Abigail are moving to a new house. They have 13 books on one shelf of their bookcase, but the narrow box Terry is packing can only hold a stack of 12 books. Abigail is c      Log On

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Question 408947: Terry and Abigail are moving to a new house. They have 13 books on one shelf of their bookcase, but the narrow box Terry is packing can only hold a stack of 12 books. Abigail is convinced that all 13 books will fit if only they are stacked in the correct order. She tries several possible ways of stacking the books before giving up and admitting that she was wrong - only 12 books can fit. If Abigail had persisted and tried every possible way of stacking the books, how many different orders would she have had to try?
Answer by solver91311(24713) About Me  (Show Source):
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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:




You can do your own calculator work.

John

My calculator said it, I believe it, that settles it
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