Direction: Study the information given below carefully and answer the question that follow.

Seven persons P, Q, R, S, T, U and V sit in a straight row facing north. R sits 3rd to the left of P. Q sits adjacent to P. S sits 2nd to the right of Q. T sits at the extreme right end. U sits to the left of V, who is not adjacent to S. How many persons sit to the left of V?