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✨ Best Answer ✨

それぞれの集合をa~gで置いてみましょう
n(A)=a,d,g,f
n(B)=b,d,e,g
n(C)=c,f,e,g
みたいに。
それを上の等式にあてはめると、a~gが1つずつになりますよ

🍓みるく🍓

助かりました!!
ありがとうございます😊✨

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