Eight friends P, Q, R, S, T, U, V and W sit in a straight row, all facing north. (i) T sits at an extreme end. (ii) R sits immediately to the right of T. (iii) Only one person sits between T and P. (iv) There are three persons between P and Q. (v) Q sits second to the right of U. (vi) S sits immediately to the left of Q. (vii) U sits immediately to the right of V. (viii) W sits at the other extreme end. If all eight are re-seated in alphabetical order from left to right, how many of them remain in their original seat?

Question

Accepted Answer

One. Original order: T, R, P, V, U, S, Q, W. Alphabetical order: P, Q, R, S, T, U, V, W. Comparing seat by seat, only the 8th seat (W) is unchanged, so exactly one remains.

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