Mathematics
Junior High
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3.編號為2、3、4、4、5、5、6、7、8、9的十張卡片中,先取出編號為6的卡片,然後由
剩下9張卡片中任取2張,則所取的三張卡片號碼之中位數等於6的機率是多少
多點思考-45-多點數學
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