Five people are to serve on a committee to choose a new school principal, W,X,Y and Z are teacher. S,T,U and R are parents. The committee must have at least two parents and at least two teachers. The committee must conform to the following conditions:
If either W or X serves on the committee, Z will not serve on the committee.
If S serves on the committee, U will not serve on the committee.
If U serves on the committee, R must serve on the committee.
Explanation:
From the information given in the condition, the following diagram can be drawn to help you answer the question: