If the room assigned to Robin is a single, which one of the following could be true?

Dina on July 21, 2021

about choice A

why is choice a wrong?

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Emil-Kunkin on November 30, 2023

If R is in a single we know the assignments of two full rooms, R and KP. This leaves L and STV to be assigned. There are two ways to assign the remaining four, two doubles or a triple and a single. Either way, there is no scenario in which there is only one double with second years, there are either two doubles, both with at least one second year, or zero doubles.