Question 328028
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The probability of anything is the number of ways that it can happen that you would consider a success divided by the number of ways it can happen total -- successes and failures.


There are 100 adult books and 160 children's books, hence there are 260 total books.  That is your denominator.


The numerators are:


1.  (The number of adult books minus the number of adult non-fiction) + (the number of children's books minus the number of children's non-fiction)


2.  The total number of books (260) minus the number of children's non-fiction.


3.  The number of adult books plus the number of children's non-fiction.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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