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QUESTION
a hat contains a number of cards, with 30% white on both sides; 50%black on one side and white on the other; 20%black on both sides.
a hat contains a number of cards, with 30% white on both sides; 50%black on one side and white on the other; 20%black on both sides. The cards are mixed up then a single card is drawn at random and placed on the table. If the top side is black, what is the chance that the other side is white?
