Question

Use the Venn diagram and the given conditions to determine the number of elements in region II.


n(U)=38
n(A)=18
n(B)=20
n(C)=19
n(A∩B)=12
n(A∩C)=8
n(B∩C)=6
n(A∩B∩C)=4

Answer 1

we can do this easily if you fill in the parts. on the other hand we can also compute
\[38-(18+20+19-12-8-6+4)\]

Answer 2

3?

Answer 3

that is what i get, yes