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→Замечания
1) <tex dpi = "140">{Q_B}(\oslash) = \frac{P(\oslash \cap B)}{P(B)} = \frac{P(\oslash)}{P(B)} = 0</tex>
2) <tex dpi = "140">{Q_B}(\Omega) = \sum_sum\limits_{\omega \in \Omega}^{}\frac{P(\omega \cap B)}{P(B)} = \sum_sum\limits_{\omega \in B}^{}\frac{P(\omega \cap B)}{P(B)} + \sum_sum\limits_{\omega \in \Omega \setminus B}^{}\frac{P(\omega \cap B)}{P(B)} =
\frac{P(B)}{P(B)} + \frac{P(\oslash)}{P(B)} = 1</tex>
<tex dpi = "140"> = \frac{P(A_1 \cap B) + P(A_2 \cap B) + ... + P(A_n \cap B))}{P(B)} = {Q_B}(A_1) + {Q_B}(A_2) + ... + {Q_B}(A_n)</tex>
== Пример ==
