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Each of the three charities in the Novel Grove Estates has 8 [#permalink]
03 Apr 2006, 21:39
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Each of the three charities in the Novel Grove 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 of boards of directors?