Abox contains 20 red marbles and 30 blue marbles. a second box contains 10 white marbles and 40 black marbles. if you choose one marble from each box without looking, what is the probability that you get a blue marble and a black marble?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?