उन वर्गों के समूह की पहचान करें जो एक ऐसे संबंध का सबसे अच्छा प्रतिनिधित्व करते हैं जहाँ दो विशिष्ट उपसमुच्चय परस्पर अपवर्जक हैं लेकिन दोनों एक बड़ी व्यापक श्रेणी के अंतर्गत पूरी तरह से समाहित हैं।

In a Venn diagram consisting of a rectangle, a circle, and a triangle, if the region enclosed by both the rectangle and the circle but not by the triangle is labeled with a specific number, and that number is 4, which option correctly identifies this value?

In a certain Venn diagram representing professional and demographic categories, if a triangle represents doctors, a rectangle represents women, and a circle represents postgraduates, which region representing the intersection of all three shapes gives the total number of postgraduate female doctors as 15?