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On the Conditional Reasoning Drill, problems 2 and 9 (2018 edition), why does the original diagram G4 arrow Q2 appear to contradict the original statement. It seems like the original diagram should read G4 with a slash through it. Am I suppose to flip this in my head and if so, when is it suppose to be flipped and when not? Similarly, in problem 9, N does not perform 1st, but the original diagram shows N does perform first. It seems like the diagram should read N1 with a slash through it.
 Jeremy Press
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Hi hughes,

The rules in those questions both use the term "unless," which requires a special approach to diagramming called the Unless Equation (you'll find that discussed earlier in the chapter, so make sure you review that discussion again!).

Under the Unless Equation, the term in the rule that is modified by unless automatically becomes the necessary condition.

So in question 2: :arrow: Q2
And in question 9: :arrow: P2

The remaining term has to be negated and then diagrammed as the sufficient condition (this is a way of accurately handling/factoring out the additional negative that the "un" in "unless" introduces to the statement).

So in question 2: G4 :arrow: Q2
And in question 9: N1 :arrow: P2

Make sure you thoroughly review and master the Unless Equation. It's your key to getting rules right in LOTS of situations in Logic Games!
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 Dave Killoran
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As a followup, this article explains The Unless Equation in detail, and covers problem #2 you asked about: viewtopic.php?t=13220&p=32001


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