Recall from Unit 7.1 (two tutorials back) that the union of two events corresponds to the inclusive "or" in logic. In other words,

In this case, E'F is the event that either the price of your stocks will not increase by at least 50%, or the Dow Jones Average will go up.

(If you would to review this topic, go back to the tutorial for Section 7.1 by pressing the "all tutorials" button and selecting "Sample Spaces and Events"...)


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