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As mentioned above, this principle holds true only if the events are independent of each other. If the events are dependent, multiplying the number of possible outcomes for each event will not be correct. Considering the previous example, suppose now that the spiral-bound notebooks came only in red.
There are still 2 types of notebooks and a total of 3 colors for the non spiral bound notebooks. However, the possible number of different notebooks a customer may buy is not 2×3=6. Rather, it is 4. This happens because, in this case, the possible colors for a notebook depend on the type of notebook.