The sales representative could visit any of the following companies immediately after P except :
Answer: E
Correct answer: M
The company immediately after P is the fourth. M must precede N and R, and N must precede Q, so three visits have to come after M. With M fourth only two places remain, which is not enough. Every other company can be placed fourth in some valid schedule, so M is the exception.
Please log in or register to report this question.