If the flats of Prof. Tripathy and Prof. Purohit are interchanged, whose flat will be next to that of Prof. Usman?
Explanation:
Consider the solution to the previous question
A possible arrangement of the flats is:
U R P Q T S
Therefore, even if the flats of Prof. Purohit and Prof. Tripathy are interchanged, Prof. Rathor will always be next to Prof. Usman.
Hence, option (a).
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