ETS Quant Reasoning Practice Set 2 Question 17

After reading their explanation, is there a gregmat video on this type of notation? I don’t fully understand this.

Thank you!

I think Greg has solved this question but I can’t remember the class. I will try to look for it in the meantime you can watch Vince way of approaching it https://www.youtube.com/watch?v=X1p_NKUawYE

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