A sales representative plans to visit each of six companies M, N, P, Q, R and S exactly once during the course of one day. She is setting up her schedule for the day according to the following conditions:
1. She must visit M before N.
2. She must visit N before Q.
3. The third company she visits must be P.
Which of the following must be true of the sales representative’s schedule?
1
Visits M before Q
2
Visits N before R
3
Visits P before M
4
Visits P before S