SOLUTION: How many ways: 1- 20 students can sit in a class of 30 chairs. 2- 20 students should sit on 30 chairs in a row. 3- 20 students should sit around a table of 20 chairs.

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Question 844042: How many ways:
1- 20 students can sit in a class of 30 chairs.
2- 20 students should sit on 30 chairs in a row.
3- 20 students should sit around a table of 20 chairs.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

How many ways:

1-  20 students can sit in a class of 30 chairs.  30C20

2-  20 students should sit on 30 chairs in a row. (30C10)20!

3-  20 students should sit around a table of 20 chairs. 19!