An opinion poll is conducted among a state's electorate to determine the relationship between their income levels and their stands on a proposition aimed at reducing state income taxes. Voters are classified as belonging to either the low-, middle-, or upper-income group. They are asked whether they favor, oppose, or are undecided about the proposition. Let the letters L, M, and U represent the low-, middle-, and upper-income groups, respectively, and let the letters f, o, and u represent their responses—favor, oppose, and undecided, respectively. (Enter your answers using letter combinations separated by commas. Example: Lf, Uu, ...) (a) Describe a sample space S corresponding to this poll. S =        (b) Describe the event E1 that a respondent favors the proposition. E1 =         (c) Describe the event E2 that a respondent opposes the proposition and does not belong to the low-income group. E2 =         (d) Describe the event E3 that a respondent does not favor the proposition and does not belong to the upper-income group. E3 =

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