SOLUTION: john goes to a bookstore with the intent of buying 4 books about American History and then putting them on his new bookshelf. The bookstore he visits has 21 books on the subject .
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Question 648753: john goes to a bookstore with the intent of buying 4 books about American History and then putting them on his new bookshelf. The bookstore he visits has 21 books on the subject . How many different ways are there for John to select 4 books and then arrange then on his bookshelf? Answer by lynnlo(4176) (Show Source):
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