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?

**Thanks for viewing my problem. **

**(Cphill, move your eyes over on this question plz)**

MathyGoo13 Apr 25, 2021

#1**0 **

Don't know how to solve this one, MG.......maybe someone else does....(sorry !!! )

CPhill Apr 25, 2021