In three sets Q, R and S, the following conditions are found.
In Q ∩ R there are 9 elements.
In Q ∩ S there are 4 elements.
In R ∩ S there are 11 elements.
If (Q ∩ R) ∪ (Q ∩ S) ∪ (R ∩ S) includes 18 elements, how many elements are in Q ∩ R ∩ S?
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(Cphill, move your eyes over on this question plz)
Don't know how to solve this one, MG.......maybe someone else does....(sorry !!! )