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UPSC NDA I 2012 Mathematics Paper

For the next Four (4) questions that follow:
In a city, three daily newspapers A, B, C are published, 42% read A;51% read B;68% read C;30% read A and B;28% read B and C;36% read A and C;8% do not read any of the three newspapers.

Question : 117

Total: 120

What is the percentage of persons who read all the three papers?

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