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# Conditional/Or rules

Alum Member
234 karma
Rule: "J will arrive after M or before N, but not both"

Correct translation: N and M arrive before J or they both arrive after J.

(N- J) (J-N)
or
(M- J) (J-M)

Question: Why can't the translation be (N - J - M)?
Here J is neither after M nor before N.
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• Alum Member
234 karma
Yikes, that didn't format like I wanted. In my example the columns, and not rows, are grouped.
• Legacy Inactive ⭐
1294 karma
In my understanding the OR rule indicates that one of them MUST happen. It cannot be that both cannot happen. It's either M-J or J-N. One of these two must happen.

A or B but not both means one must be in at the exclusion of the other.
• Alum Inactive ⭐
8021 karma
I broke this down as either M-J or J-N but not M-J-N, so the four possible orders are: N-M-J, M-N-J, J-N-M, or J-M-N.

It can't be N-J-M because the rule states that J must be either after M, or before N, and neither is the case in the N-J-M ordering. It has to meet one of those specifications, but can't meet both of them, and it also can't meet none of them, due to the way the stimulus is worded. Hope that helps, let me know if you have any questions.
• Alum Member
234 karma
Thanks guys, I was just overthinking it. "J WILL..." was what I skipped over.
• Alum Inactive ⭐
7468 karma
Another possible way to write it out is N--J--M with a switch from N to M, then box it, then put a giant slash through it. For economy.
• Alum Member
221 karma
In terms of "Lawgic"
J--N <-------> /(M--J)
M--J <-------> /(J--N)
• Legacy Inactive Sage Inactive ⭐
edited June 2015 7965 karma
@mheannarino said:
Rule: "J will arrive after M or before N, but not both"

Correct translation: N and M arrive before J or they both arrive after J.

I would diagram this as:

Some LSAT Trainer rule notation for ya (though I could almost swearsies I've seen this on 7sage as well?). When I have a "this one OR that one but not both" rule I notate that with both options separated by an underlined "OR."