I want to read 4 books over the next month.  My bookshelf has 12 different books.  In how many ways can I choose which books to read over the next month, without regard to the order that I read them?
Question:
I want to read 4 books over the next month.  My bookshelf has 12 different books.  In how many ways can I choose which books to read over the next month, without regard to the order that I read them?
Answer:
Let's think step by step.

user
495
I want to read 4 books over the next month.  My bookshelf has 12 different books.  In how many ways can I choose which books to read over the next month, without regard to the order that I read them?
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