In a town of 20,000 families, it was found that 40% families buy newspaper P, 25% families buy newspaper Q and 10% buy newspaper R, 5% families buy P and Q, 3% families buy Q and R, 5% buy P and R. If 1% of the families buy all three papers. Find the number of families which buy 1. P only 2. Q only 3. None of P ,Q R

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