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\n" ); document.write( "In choosing the books, a student can look at each book and either choose to select it or not. That's 2 choices for each book.
\n" ); document.write( "If there are n books in the library, that means 2 choices for each book, for a total of 2^n choices.
\n" ); document.write( "This problem asks for the number of ways a student can select one or more books, so selecting none of the books is not an option. So the number of ways of choosing one or more of n books is 2^n-1.
\n" ); document.write( "In this problem, there are k different books and I copies of each book.
\n" ); document.write( "Assuming the student will not be selecting more than one copy of any book, the number of books to choose from is k, and the number of ways of selecting one or more of them is 2^k-1.
\n" ); document.write( "If the student can select more than one copy of any book, then the number of books to choose from is (k*I), and the number of ways of choosing one or more of them is 2^(k*I)-1.
\n" ); document.write( "ANSWERS:
\n" ); document.write( "(a) not selecting multiple copies of any book: 2^k-1
\n" ); document.write( "(b) allowing selection of multiple copies of any book: 2^(k*I)-1
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