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At the Russian Language Olympiad, 250 participants were placed in three classrooms. The first two managed to accommodate 120 people each, the rest were transferred to a spare classroom in another building. Find the probability that a randomly selected participant wrote the Olympiad in a spare audience.

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In total , they were sent to the reserve audience 250 − 120 − 120 = 10 people. Therefore, the probability that a randomly selected participant wrote the Olympiad in a spare audience is 10 : 250 = 0.04.

Answer: 0.04.

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