Seven persons — P, Q, R, S, T, U and V — sit in a straight row, all facing north. R sits at the extreme left end. Exactly three persons sit between R and S. T sits immediately to the left of S. Q sits third to the right of P. V sits at one of the extreme ends. Who sits at the extreme right end of the row?

Question

Accepted Answer

V. R=1. Three persons between R and S puts S at seat 5. T immediately left of S -> T=4. V at an extreme end must be seat 7 (seat 1 is R). Remaining P, Q, U go in 2,3,6 with Q=P+3 -> P=3, Q=6, U=2. Order: R U P T S Q V. Extreme right is V.

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