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Four persons P, Q, R and S are to be seated in a row, all facing the same direction, but not necessarily in the same order. P and R cannot sit adjacent to each other. S should be seated to the right of Q. The number of distinct seating arrangements possible is:

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  1. 2
  2. 4
  3. 6
  4. 8

Answer (Detailed Solution Below)

Option 3 : 6
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All the possible ways will be:

R Q S P → (possible)

P Q S R → (possible)

R Q P S → (possible)

P Q R S → (possible)

Q R S P → (possible)

Q P S R → (possible) 

The total number of possible ways will be = 6 

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