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The link says the same thing. I have the formulas, its just that I am not sure why formula for P(AuBuC) is different than "at least one." Aren't those refering to the same things? It seems like, "at least one" is obtained by adding P(AnBnC) to P(AuBuC). What can be included in the "at least one" that can not be included in P(AuBuC)?
I think that 'at least one' should be the same as union. But they seem to have something else in mind (I don't have the faintest clue what that is). In terms of the diagram, the area that corresponds to 'at least one set' according to them, doesn't represent anything. You may want to ask them for clarification on their blog post. _________________
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...