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 I also bought 7 different postcards. How many ways can I send the postcards to my 3 friends, so that each friend gets at least one postcard?

 

how could i solve this question using the formula n!/k!(n-k!)

 Jan 17, 2020
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The number of ways is C(11,3) + C(10,2) + C(9,1) = 219.

 Jan 17, 2020

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