In a certain city 60% of the people subscribe to newspaper A, 50% to B, 40% to
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In a certain city 60% of the people subscribe to newspaper A, 50% to B, 40% to C, 30% to A and B, 20% to B and C, and 10% to A and C, but no one subscribes to all three. What percentage subscribe to
(a) At least one newspaper?
(b) Exactly one newspaper?
(c) Only to A?
(d) Only to B?
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