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no(A) = nob)-D CAO B) =40
n (AUB)= 10
n(U) =?

Sagot :

Answer:
n(A)=30
Step-by-step explanation:
n(A)+ n(B) -n(A∩B)=n(AUB)
let n(A) = x
x+20-10=40
x+10=40
x=40-10
x=30
hope this will help u
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