Student: a certain organization has three committees. only two persons are members of all committees, but every pair of committees have three members in common. what is the least possible no of member of members on any one committee?
Options:
(A) 4
(B) 5
(C) 6
(D) 7
(E) 8.
Another student: Let's say, hmmm...
Total 4 members minimum required to serve only on one committee. Final answer: (A).