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Suppose there are 9 students in training course. And we want to calculate the number of ways when A. Five student were selected, and the

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Suppose there are 9 students in training course. And we want to calculate the number of ways when A. Five student were selected, and the position is in consideration. B. Six student were selected, the position is NOT in consideration. Construct the probability distribution of getting number 1 when throwing a dice three times. Then find the mean and the variance

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