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The interactive link of "Treasure Box" in CCTV's "Lucky 52" column is a quiz game, and the rules of the game are as follows: among 2 trademarks, there are five.
Because he has turned over two prizes, there is only 5-2=3 (one) left.
He has turned over two trademarks, so there is only 2-2=18 (one) trademark left.
Then the probability of winning the prize for the third time is 3/18 = 1/6.
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