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

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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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

300

720

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