這是問條件機率嗎?

[peecome (bunnyplaycat)]

94年清大電機聯招的工數第2題
問:What is the probability that a person from this location who has
   the rash had the disease?

是用條件機率P(had the disease l has the rash)嗎??
我覺得是
但是解答本解成交集事件~
想問問大家的看法!?

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