Directions :Study the following information carefully and answer the given questions.
L. M. N, O, P, Q , R and S are sitting around a circular table facing the centre but not necessarily in the same order . P sits third to left of M. P is an immediate neighbour of both o and S. Only one person sits between O and Q. R is an immediate neighbour of O. Only one person sits between R and N. 

Q:

Four of the following five are alike in a certain way and thus form a group. Which is the one that does not belong to that group?

• 1
  MS
• 2
  QM
• 3
  OO
• 4
  RP
• 5
  SO