设A,B,C相互独立
,则
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· <img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1698485386244793ba258917b40408ad7d1308b8c516dimage96.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/1698485386244793ba258917b40408ad7d1308b8c516dimage96.png"