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stubbornp
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Each of the three charities in novel group estates has 8 persons serving on its board of directors.If exactly 4 persons serve on 3 boards each and each pair of charities has 5 persons in common on their boards of directors,then how many distinct persons serve on one or more boards of directors?
A. 8
B. 13
C. 16
D. 24
E. 27
A. 8
B. 13
C. 16
D. 24
E. 27
