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 :
(i). She must visit M before N and R.
(ii). She must visit N before Q.
(iii). The third company she visits must be P.
The sales representative could visit any of the following companies immediately after P except :
Since P is at third place and orders M, N, Q and M, R are to be followed, so immediately after P she can visit any company except M and which may occupy first or second pace because Q, R and N cannot precede it.