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What do the U, upside-down U and the line mean in this question? Added a table for relevance

 May 15, 2020
 #1
avatar+26620 
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U means    ' Union'

the upside down U  means 'Intersection'

 May 15, 2020
 #2
avatar+8998 
0

Also...

 

For these,

 

You can replace  U  with  "or"

And replace  ∩  with  "and"

 

For example...

 

P(owns a PS4  U  does not own a cellphone) is the probability that a randomly selected person in the group owns a PS4 or does not own a cellphone.

 May 15, 2020

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