Question

A club with a total membership of 30 has formed 3 committees, m, s, and r, which have 8, 12, and 5 members, respectively. If no member of committee m is on either of the other 2 committees, what is the greatest possible number of members in the club who are on none of the committees?

Answer 1

let all the member of r are also the member of s then there are 10 people who are not a member of any comity