Videos on sets and unions?

Greg Mat+ Questions/Issues
1

I went through the 2 month plan and I didn’t come across any videos where Greg teaches sets and unions(A+B-AUB). Can someone give me a link to a video series where he covers that, since I’ve seen it come up a lot on GRE. Thanks :slight_smile:

2

I don’t he explicitly covered it but ETS math review has like two pages article on it under the name counting methods.
OR
You can look at Khan Academy lecture under the same heading counting methods
https://www.ets.org/gre/revised_general/prepare/quantitative_reasoning/khan_academy/

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