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pages/总复习2023t1.md

@@ -2665,6 +2665,9 @@
 						- For every finite $$A1 , A2 , · · · , An$$,
 						  ![image.png](../assets/image_1686901672954_0.png)
 						- For every event A, $$P (A) = 1 − P (A)$$.
+						- If A ⊂ B, then P (B − A) = P (B) − P (A) and P (A) ⩽ P (B).
+						- For every two events A and B,
+						  $$P (A ∪ B) = P (A) + P (B) − P (AB)$$.
 						-
 					- Properties of Probability
 			- LATER 学积分