Questions (1-3): read the following passage carefully and answer the questions. A secretary is scheduling appointments for his manager during a certain week. There are exactly nine appointments open: one on Monday, three on Tuesday, one on Wednesday, two on Thursday, and two on Friday. He must schedule seven people, M, N, O, P, Q, R and S according to the following criteria. # Two people must have appointments on Thursday, and at least one person must be scheduled for an appointment on each of the other days. # N and Q must be scheduled on the same day. # M must be scheduled for Monday. # O cannot be scheduled for Friday. # S must be scheduled for Thursday. Q- If N and Q are scheduled for Tuesday, how many different schedules are possible on Thursday?