Nine individuals – Z, Y, X, W, V, U, T, S and R - are the only candidates, who can serve on three committees– A, B and C, and each candidate should serve in exactly one of the committees.
Committee A should consist of exactly one member more than committee B. It is possible that there are no members of committee C. Among Z, Y and X none can serve on committee A. Among W, V and U none can serve on committee C. Among T, S and R none can serve on committee C.
In case T and Z are the individuals serving on committee B, how many of the nine individuals should serve on committee C?