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Cheldelin Middle School has 12 doors to enter or leave the building. In how many ways is it possible to enter the building by one door and leave the building by a different door?

 Mar 27, 2020
edited by helpppp  Mar 27, 2020
edited by helpppp  Mar 27, 2020
 #1
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Mmmm.....not sure.....but let's see if we  can maybe  work to a solution  ;

 

If we enter by any door, we  have 11 possible exits

 

And  this  is  true  for  any door...

 

So....we  have  12  ways to enter   and  for each of these, 11 ways to  leave

 

So

 

12 * 11   =

 

132 ways

 

cool cool cool

 Mar 27, 2020

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