Question: COMMON STOCKS Robin purchased shares of a machine tool company and shares of an airline company. Let E be the event that the shares of the machine tool company increase in value over the next 6 mo, and let F be the event that the shares of the airline company increase in value over the next 6 mo. Using the symbols , , and c , describe the following events.
a. The shares in the machine tool company do not increase in value.
b. The shares in both the machine tool company and the airline company do not increase in value.
c. The shares of at least one of the two companies increase in value.
d. The shares of only one of the two companies increase in value.