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There are 18 empty chairs in a room. How many different ways can 4 people be...

There are 18 empty chairs in a room. How many different ways can 4 people be seated in the room?

Math   Statistics-And-Probability   
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Answer #1

When we have to select r subject out of n , then we use combination nCr

nCr =    ; n ≥ r

Here n is total number of chairs = 18 and r is number of people = 4

nCr = = =

=

=

= 3060

So there are 3060 different ways can 4 people be seated in the room.

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