If Iris is scheduled for the next day after Harry, which one of the following lists all those days any one of which c...

Jvsquaq1 October 3, 2023

Since when do we start ignoring the contropositives?

How and why do we ignore the contra here but not other places, rules #2 says if H is on monday N is on Friday, contrapositive would be N not on 5 then H not on 1, and in the case of wednesday H is not on 1 its on day 3? But then nancy shows up in the only possible block that is friday?

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Emil-Kunkin October 3, 2023

The contrapositive here is indeed if n not 5 then H not 1. Having n in 5 and h in 3 doesn't violate it. The rule is that if h is 1 then n must be 5, but this doesn't ban having n in 5 without H in 1. I think you may be flipping sufficient and necessary in your head, although your articulation of the rule is spot on.