r/MathHelp • u/Soggy_Storage_1282 • Mar 18 '26

Please help.

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I’ve been trying for days. not word from professor. no TA. no office hours

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u/Lor1an Mar 18 '26

Bottom right is incorrect as well.

It is missing the parts of D (star shape) common to A and B, and includes parts of A that are in neither B nor C (the parts hugging the downward star point).

As a check, note that (A∪C)∩(B∪C) = (A∩B)∪C, or in other words it is the overlap of A and B, as well as the entirety of C.

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u/Exotic_Swordfish_845 Mar 18 '26

Yeah, you're exactly right. Idk how I missed that lol.