The regions that represent adults who drink both coffee and tea are region1 and region4.
What is a Venn diagram?
A Venn diagram is a visual representation of sets, using overlapping circles to illustrate the relationships between different groups. Shared and unique elements are depicted, aiding in logical analysis.
From the Venn diagram
Given
A is adults who drinks coffee
B is adults who drinks tea
C is adults who drinks cola
The regions that represent adults who drink both coffee and tea are
A∩B∩C = region 1
A∩B∩C' = region 4
Therefore, the regions that represent adults who drink both coffee and tea are region1 and region4.