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Twelve persons sit on twelve seats arranged in a row, and all of them are facing north. Y is the only neighbour of S. Three persons sit between S and O, who sits immediately to the left of K. More than three persons sit between K and H. K sits second to the left of P, who sits exactly between K and U. The number of persons between P and B is a multiple of 2. The number of persons between H and B is prime. Who among the following persons sits immediately to the right of H?

1. P
2. O
3. K
4. Unknown person

Correct answer: Unknown person

Solution

The arrangement constraints fix some positions, but not enough to uniquely determine H's immediate right neighbour. Since multiple valid seating arrangements satisfy all clues, the person to the immediate right of H cannot be identified uniquely.

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