设随机事件A、B互不相容,
则
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·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/169848536071248b7aa2cd33a4c2084e879eb2a2962a5image94.png"
出自:佳木斯大学语言治疗学
则
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·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/169848536071248b7aa2cd33a4c2084e879eb2a2962a5image94.png"