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In a city, three daily newspapers `A,B,C` are published. `42%` of the people in that city read A, `51%` read B and `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. The percentage of persons who read all the three papers is

A

(a) `25%`

B

(b) `18%`

C

(c) `20%`

D

(d) none of these

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