There were 4 chairs in a row and 7 students. How many ways could the students
occupy the 4 chairs if 4 students sat down every time?
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Answer:
Total chairs =7
To select 4 conservative chairs,
No. of ways =7−4+1
(n−r+1)
=4
To arrange 4 students at these 4 chairs
No. of ways =4!
⇒ Total No. of arrangements =4×4!
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