Hi,

Ten students are lined up to be seated.

in how many ways can 5 students be seated in a row of 5 chairs?

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

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

     10people   x    9people     x      8people     x      7people  x     6people    x    5people

                                     

      10   x    9   x   8   x   7 x 6 x 5 = 151,200

Wish You the Best in your Studies. 

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