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At the school awards night, a door prize is given to one person in attendance. The winner of the door prize can select 4 books

At the school awards night, a door prize is given to one person in attendance. The winner of the door prize can select 4 books from 15 different books in a box. a) In how many ways can the winner select the 4 books? b) In how many ways can the winner select the 4 books and arrange them on a shelf? c) Explain why the answers to part a and part b above are not the same

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