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How many ways are there to put 2 balls in n boxes (where n≥2) if the balls and the boxes are distinguishable?
 

 Dec 17, 2020
 #1
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nk   ways   where  n = boxes  and  k  = number of  balls

 

(We are assuming no restrictions....we can have some boxes empty)

 

cool cool cool

 Dec 17, 2020

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