2. а) если n(А) = 18, n(B) = 23 и n(АпересекаютсяВ)= 9, то n(AUB) = ?

б) если n(MUK) = 42, n(M) = 35, n(К) = 28 то, n(МОК) = ?

в) если n(СпересекаетсяD)= 7,n(С)=19, n(СUD)= 22 то ,n(D)=?​
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