4. How many ways can we select 5 class officers out of 45 students?* 2, 121, 189 1,221,759 1,222,750 2,122,179   5. How many outcomes can we get if we are going to select 3 numbers from 0 to 9, without repetition? * 321 720 24 145   6. How many outcomes can we get if we are going to select 3 numbers from 0 to 9, with repetition? * 1000 789

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