Hi,

Ten students are lined up to be seated.

in how many ways can 3 of them be seated in a row of 3 chairs?

Depends on how many people You have to choose from for each chair:

 10people for the 1st chair, 9 for the 2nd... etc 

     10people   x    9people     x      8people         

                         

      10   x    9   x   8    = 720 ways

Wish You the Best in your Studies. 

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