Answer:
72 possible combinations
Step-by-step explanation:
In order to calculate the total number of possible outcomes of using one of each category we simply need to multiply the total number of books from each category together. Since there are 4 mysteries, 3 adventures, and 6 science fiction books we multiply these values with one another.
4 * 3 * 6 = 72
Finally, we can see that there are a total of 72 possible combinations for displaying one book from each category together.
