Math problem on the set theory



Okay, I'll try to guess.

The answer is 4.

 
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It's hard to see the problem from here, but I think the answer is: .\(\displaystyle A \cap \overline B\)

. . or it might be: .\(\displaystyle \{E\flat,\; \heartsuit,\; \bigstar,\;\pi,\; \nabla,\;\blacksquare,\;C\sharp \}\)


 
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I would love to help please state the problem in complete detail...

thanks...
 
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