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(a) Find the number of ways that Magnus can give out 20 identical stickers to 5 of his friends.  (Not everyone has to get a sticker.)

 

(b) Find the number of ways that Magnus can give out 20 identical stickers to 5 of his friends, if every friend gets at least one sticker.

 Dec 21, 2022
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A computer code written in C++ gives:

10,626 ways

 

Using combinatorics, we have:

 

[20 + 5 - 1] C [5 - 1] ==24 C 4 == 10,626 ways

 Dec 21, 2022

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