What si the formula in sets
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n(AᑌB)=n(A) + n(B) -nAᑎB)
n(AᑎB)=n(A) + n(B) - n(AᑌB)
n(U)=n(Aᑌᗷ)+(n(U) - n(AᑌB)
n(A)=n(A) - n(AᑎB)
n(B)=n(B) - n(AᑎB)
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