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JAMB - Mathematics (2009 - No. 44)

In how many ways can 9 people be seated if 3 chairs are available?
720
504
336
210

Spiegazione

9P3 = _9! ways
(9-3)!

 

= 9!
6!

 

 

= 9x8x7x6!
___6!


= 504 ways

 

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