Which one of the following must be true for March?

hannah-gelber on November 28, 2020

Why

can someone explain this question please and why it is not D

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Emil-Kunkin on December 9, 2023

This is asking us what must always be the case. There are a few key deductions here, we know that only two of the three cities can be visited, and since p and s cannot be together, we know our two groups are
1:p/s
2:p/s

And since we know that HR are a block, our groups are

H R P/S

And

L P/s.

Let's see what we can do with this.

This means that the group of two can never go to V, since L is barred from V. However, the group of three could go to V with S instead of P, so d doesn't have to be true.