In a survey of political preference, $78$% of those asked were in favor of at-least one of the proposals: I, II and III. $50$% of those asked favored proposal I, $30$% favored proposal II, and $20$% favored proposal III. If $5$% favored all the three proposals, what % of those asked favored more than one of the three proposals?
A homework problem involving counting using a special case of inclusion/exclusion
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combinatorics
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1Could you please use an even _less_ useful title for your question? – 2010-10-29
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0I have the opposite reaction -- :-) -- to that of Tobias Kienzler: please choose a better title for your question. This one could apply to any question, so is absolutely useless. – 2010-11-28