Six People – A, B, C, D, E and F. 1) All are facing north. 2) F is sitting third to the left of B who is sitting immediate left to D. Therefore, we get the seating arrangement as follows: [ alt="SSC CHSL FT4 Neha Feb 11 25q Revd Hindi images Q18" src="//storage.googleapis.com/tb-img/production/19/03/SSC%20CHSL_FT4_Neha_Feb%2011_25q_Revd_Hindi_images_Q18.PNG" style="width: 433px; height: 254px;"> 3) E is not sitting at any of the extreme ends but is sitting third to the right of C. Thus, case II gets eliminated. [ alt="SSC CHSL FT4 Neha Feb 11 25q Revd Hindi images Q18a" src="//storage.googleapis.com/tb-img/production/19/03/SSC%20CHSL_FT4_Neha_Feb%2011_25q_Revd_Hindi_images_Q18a.PNG" style="width: 434px; height: 63px;"> So, A is sitting between F and E. [ alt="SSC CHSL FT4 Neha Feb 11 25q Revd Hindi images Q18b" src="//storage.googleapis.com/tb-img/production/19/03/SSC%20CHSL_FT4_Neha_Feb%2011_25q_Revd_Hindi_images_Q18b.PNG" style="width: 436px; height: 66px;"> Hence, A and C are not the immediate neighbours.