<span style="font-family: 宋体,simsun">某单位同时装有两种报警系统A与B,当报警系统A单独使用时,其有效的概率为0.70,当报警系统B单独使用时,其有效的概率为0.80,在报警系统A有效的条件下,报警系统B有效的概率为0.84. 若发生意外时,求:</span>
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