A university has 1,000 employees, of whom 400 have at least 20 years of experience (thought A), 100 are from Jeju Island (thought B), and 300 have tried the Unix system (thought C). Suppose all three ideas are independent

(1) If randomly out of 1000 people is randomly selected, what is the probability that all three conditions are satisfied? (2) If randomly out of 1000 people is randomly selected, what is the probability that at least two of these three conditions will be satisfied?

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