设A,B为两随机事件且<img class=jc-formula data-tex=B\subset A src=https://huaweicloudobs.ahjxjy.cn/35CFA1A693DFC875CC9D64E26EA1648D.png style=vertical-align: middle;/>，则下列式子正确的是

【单选题】【消耗次数：1】

① <img class=jc-formula data-tex=P(A\cup B)=P(A) src=https://huaweicloudobs.ahjxjy.cn/6844D37B5C965E08A74718ADA2D568C8.png style=vertical-align: middle;/>

② P(AB)=P(A)

③ P(B|A)=P(B)

④ P(B-A)=P(B)-P(A)

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