Question
How many persons are not facing south?
Study the following information carefully and answer the questions given below. Eight persons A, B, C, M, N, O, Y and Z are sitting in straight line. Some of them are facing north while some of the facing south but not necessarily in the same order. Y sits at one of the extreme ends of the line. Only three persons sit between O and Y. A sits second to the right of O. Both C and B are facing the same direction. M faces north. N sits to the immediate right of Y. C sits third to the right of B. Both O and N face the same direction as A. Only three persons sit between M and Z. O sits to the immediate left of M. Z is not facing the same direction as Y. Both the immediate neighbors of M face opposite directions.Solution
Y sits at one of the extreme ends of the line. Only three persons sit between O and Y. N sits to the immediate right of Y. O sits to the immediate left of M. M faces north. Case-1 
Only three persons sit between M and Z. Z is not facing the same direction as Y. C sits third to the right of B. Both C and B are facing the same direction. A sits second to the right of O. Both the immediate neighbors of M face opposite directions. Both O and N face the same direction as A. Hence, case 1 gets eliminated. 
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