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P(危|3壱) = P(3壱|危)P(危) / P(3壱)

伎 蟆 . 蟆 る 蠏螳螳 100覈企. 企 100覈 3壱 危 襯?
  • P(危): 蠏螳れ 1殊姶 譟伎 0.5(50%) .
  • P(3壱): 3壱 襯 豪 0.5 螳 0.5 * 0.5 * 0.5 = 0.125 .
  • P(3壱|危): 危 3壱 襯 0.2 .
  • P(危|3壱): 3壱 危 襯, (0.2 * 0.5) / 0.125 = 0.8
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