Let A, B, C be finite sets. Suppose n(A) = 10 , n(B) = 15 , n(C) 20 , n(A intersection B) = 8 , n(B intersection C) = 9. Then n( A union B union C) may be equal to

Dear student
Given: n(A)=10, nB=15, nC=20,nAB=8,nBC=9Now,nABC=nA+nB+nC-nAB-nBC-nAC+nABCnABC=10+15+20-8-9-nAC+nABCnABC=28-nAC+nABC
regards

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please give the value of  n(A intersection C)
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