How many persons sit between K and P?

O sits third to the right of N. O sits second to the left of P. We have two cases, first, when N sits at extreme left end and second, when N sits second from one of the extreme ends. Case 1: When N sits at extreme left end. N ____  _____  O _____ P ____ Case 2: When N sits at second from the left end. _____ N ____  _____  O _____ P Four persons sit between Q and L. Q doesn't sit at any of the ends of the row. In case 1, L sits at extreme right end. In case 2, L sits at extreme left end. Case 1: When N sits at extreme left end. N         Q         ____ O     _____       P         L Case 2: When S sits second from the left end. L          N         _____  _____  O    Q    P K doesn't sit adjacent to M. Case 2 gets eliminated. The final arrangement is as follows. N         Q         K/M     O         M/K     P         L Either two or no one sits between K and P.