I found a questions in Chinese CCE so do you want to finish it? | Mathematics | Page 1

charred pagoda Apr 29, 2026, 5:30 AM

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Given the universal set
U = {1, 2, 3, 4, 5, 6, 7, 8},
M = {3, 4, 5, 6},
N = {4, 5, 6, 7},

then C_U (M \cap N) = ?

(Here, C_U means the complement of the set M \cap N in the universal set U.)

Options:
A. {2, 8}
B. {4, 5, 6}
C. {2, 3, 7, 8}
D. {3, 4, 5, 6, 7}

prisma fjordBOT Apr 29, 2026, 5:30 AM

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swift light Apr 29, 2026, 5:31 AM

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what have you tried and what do you not get?

flat dagger Apr 29, 2026, 5:33 AM

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so firstly, what is N \cap N?

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that means which elements are in M but not N

swift light Apr 29, 2026, 5:33 AM

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oh you want to take over?

flat dagger Apr 29, 2026, 5:33 AM

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idk

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@charred pagoda

swift light Apr 29, 2026, 5:33 AM

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then I'll let you have it.

flat dagger Apr 29, 2026, 5:33 AM

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ok

charred pagoda Apr 29, 2026, 5:35 AM

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Soz bro I just roughly translate it in ChatGPT

flat dagger Apr 29, 2026, 5:36 AM

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?

charred pagoda Apr 29, 2026, 5:36 AM

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And not check it more

outer knoll Apr 29, 2026, 5:36 AM

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cap is intersection

flat dagger Apr 29, 2026, 5:36 AM

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wdym

outer knoll Apr 29, 2026, 5:36 AM

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cup is union

charred pagoda Apr 29, 2026, 5:36 AM

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Wow👍 👍 👍

flat dagger Apr 29, 2026, 5:36 AM

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oh

flat dagger Apr 29, 2026, 5:36 AM

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charred pagoda Wow👍 👍 👍

is that sarcastic...

outer knoll Apr 29, 2026, 5:36 AM

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yeah that's about it

flat dagger Apr 29, 2026, 5:37 AM

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uhh

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so do you need help or what

outer knoll Apr 29, 2026, 5:37 AM

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charred pagoda 1. Given the universal set U = \{1, 2, 3, 4, 5, 6, 7, 8\}, M = \{3, 4, 5, 6\}, N...

why is there no set operation between C_U and (M\capN)

charred pagoda Apr 29, 2026, 5:37 AM

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I just share it

swift light Apr 29, 2026, 5:38 AM

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might be helpful to just show the original question at this point.

flat dagger Apr 29, 2026, 5:38 AM

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yeah

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(i can read chinese)

charred pagoda Apr 29, 2026, 5:38 AM

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Okay

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If you understand Chinese it is fine.

swift light Apr 29, 2026, 5:39 AM

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,rccw

tall portalBOT Apr 29, 2026, 5:39 AM

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swift light Apr 29, 2026, 5:40 AM

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basically just the complement of M \cap N.

flat dagger Apr 29, 2026, 5:40 AM

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so whats M intersect N

charred pagoda Apr 29, 2026, 5:40 AM

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flat dagger Apr 29, 2026, 5:40 AM

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yes, we can see it

charred pagoda Apr 29, 2026, 5:40 AM

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Cool

flat dagger Apr 29, 2026, 5:40 AM

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so do you know how to do M intersect N

charred pagoda Apr 29, 2026, 5:41 AM

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I know its answer

flat dagger Apr 29, 2026, 5:41 AM

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oh

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so why send it

charred pagoda Apr 29, 2026, 5:41 AM

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Just share

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I have said

flat dagger Apr 29, 2026, 5:41 AM

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oh

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A

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right

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ok bye then

charred pagoda Apr 29, 2026, 5:41 AM

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As a fresh man entering the channel

flat dagger Apr 29, 2026, 5:41 AM

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freshman is grade ?

charred pagoda Apr 29, 2026, 5:41 AM

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Nope

flat dagger Apr 29, 2026, 5:42 AM

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8? 9? 5?

charred pagoda Apr 29, 2026, 5:42 AM

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Just green hand I mean

flat dagger Apr 29, 2026, 5:42 AM

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im grade 7 and this is easy asf

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so

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?

charred pagoda Apr 29, 2026, 5:42 AM

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I am newcomer

flat dagger Apr 29, 2026, 5:42 AM

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oh

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ok

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see you

charred pagoda Apr 29, 2026, 5:42 AM

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In the channel

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Okay bye

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Maybe if it is available I will share more

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Answer C

swift light Apr 29, 2026, 5:50 AM

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charred pagoda Just share

if you wish to share problems, there's #math-discussion I believe. this is for people who are stuck with questions.

charred pagoda Apr 29, 2026, 5:52 AM

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Sox

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Six

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Soz

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Sorry

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I am new

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I don’t know it clearly before

flat dagger Apr 29, 2026, 6:00 AM

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charred pagoda Answer C

oh sh-- i thought intersection was union

#I found a questions in Chinese CCE so do you want to finish it?