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# Or, Not Both (LR And In-Out Games)

Member
edited October 2015 343 karma

Logical Reasoning (Lesson 25 of 40, 9m)
Or (3 options) = A is selected, B is selected or both A and B are selected.

Logical Reasoning (Lesson 27 of 40, 5m)
Not both – negate the Necessary, then contropose. In short, 1, A or B must be selected.

Advanced Logical Reasoning (Lesson 2 of 15, 5m)
Or is different because it has (2 options) = A is selected or B is selected. A and B are not selected together.

In-Out Games (Lesson 1 of 20, 5m)
Or is back to the original lesson, (3 options) = A is selected, B is selected or both A and B are selected.

Not both is different because 1, A or B can be is selected or nothing has to be selected.
Show Related Discussions

• #### Either or/not both rules...how do we know when to represent them on the in out chart?Hi everyone. One theme I've noticed in JY's videos, is that he'll identify a bunch of not both or either or rules, and then chose one to put on the …

• Free Trial Member
82 karma
I don't have the lessons but here's the definitions:

"OR" means at least one is selected (both can be also selected)
"Not both" means only one or none is selected
"Either A or B, but not both" means one must be selected, and you cannot have both nor neither
"At least one, but not both" means one must be selected, and you cannot have both nor neither

The last two definitions are pretty much the same, but questions might word them differently like that.
• Core
1644 karma
The differences you mentioned above aren't necessarily contradicting each other. In the advanced lessons, JY is explaining what happens to or/not both when placed with conditionals. In the beginning lessons, he is showing what the logical definition of each is. In the advanced lessons, he is explaining the definition when these ambiguous words are applied to conditional statements. Could this be the difference you are seeing?