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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
Paliwanag
9P3 =
_9!
ways
(9-3)!
=
9!
6!
=
9x8x7x6!
___6!
= 504 ways
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