Two events $A$ and $B$ are mutually exclusive (disjoint) if they cannot occur simultaneously, meaning:
$$A \cap B = \emptyset \implies P(A \cap B) = 0$$By definition of conditional probability:
$$P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{0}{P(A)} = 0$$दो परस्पर अपवर्जी (mutually exclusive) घटनाओं के लिए, दोनों एक साथ घटित नहीं हो सकती हैं:
$$A \cap B = \emptyset \implies P(A \cap B) = 0$$सप्रतिबंध प्रायिकता की परिभाषा से:
$$P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{0}{P(A)} = 0$$