Step 1: Understanding the Concept:
We need to find the intersection of three sets represented by different geometric shapes. The region that lies inside the square, the triangle, and the circle simultaneously represents the subset of all three categories.
Step 2: Detailed Explanation:
1. Square: Represents women.
2. Triangle: Represents corporate managers.
3. Circle: Represents MBAs.
The question asks for women (square) who are also corporate managers (triangle) and have an MBA (circle). Therefore, we look for the number in the region where all three shapes overlap.
Looking at the diagram, the central region shared by the square, triangle, and circle contains the number 3.
Step 3: Final Answer:
The region numbered 3 represents women who are corporate managers and have done an MBA as well.