Out of books, in how many ways can a set of one or more books be chosen?
Explanation for the correct option:
Determine the number of ways, one or more books can be chosen.
The number of ways of choosing no book is given by: which is
We have a total of books, which can be chosen in a total of ways.
Therefore, the number of ways one or more books can be chosen is given as follows:
(Total number of ways of selecting a book Number of ways of not selecting any book).
Hence, The correct answer is option (B)