+965 Find the number of ways that Magnus can give out $12$ identical stickers to $2$ of his friends. (Not everyone has to get a sticker.)
+1950 We can essentially list everything out.
We have
12−011−110−29−38−47−56−65−74−83−92−101−110−12
As you can see, there are 13 ways we can do this.
Thanks! :)
