PTC.S3.Q18 - Chelas and Stelma are required to leave their respective stations

httbora

This is a Must be false question.
I have a difficult time making two different diagrams about the conditions.
[ Chelas and Stelma are required to leave their respective stations immediately to pursue any prisoner who attempts to escape from their sector. Furthermore, unless they are pursuing such a prisoner, Chelas and Stelma are forbiddened to leave their stations until their replacements have arrived. ]

My thought is 1. pursue any prisoner who attempts to escape -> C and S leave their sectors
2. ~forbbidened to leave stations until their replacements have arrived -> pursue prisoner

Can you help me to make right diagrams?

Clemens_

I would diagram this somewhat as follows:

(1) If PRISONER ESCAPES, then LEAVE AND PURSUE
(2) If not PRISONER ESCAPES, then REMAIN AT STATION

We furthermore know: Only ONE of Chelas and Stelmas violated these rules. It is not the case that both violated them.

The question stem now asks: If all this is true, which of the following cannot be the case?

Answer Choice (D) indicates: PRISONER ESCAPES happens, but neither Chelas nor Stelmas LEAVE AND PURSUE. That is, in both cases, A -> B, as well as A, but in neither case B. This cannot be the case: If answer choice (D) is right, both Chelas and Stelmas violated the rules, not just one of the two. This goes against the information we get from the stimulus.

httbora

Thank you so much! I really appreciate you!