odd ball problem

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stubbornp: Master | Next Rank: 500 Posts; Posts: 496; Joined: Sun May 04, 2008 11:01 pm; Location: mumbai; Thanked: 7 times; GMAT Score:640

by stubbornp » Sun Oct 12, 2008 11:24 am

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

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Source: Beat The GMAT — Problem Solving | Sun Oct 12, 2008 11:24 am

parallel_chase: Legendary Member; Posts: 1153; Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members; Thanked: 146 times

by parallel_chase » Sun Oct 12, 2008 2:13 pm

refer this

https://www.beatthegmat.com/sets-problem-t20544.html

No rest for the Wicked....

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