this might seem easy but i am easily confused.
Find the number of ways that Magnus can give out 10 identical stickers to 8 of his friends. (Not everyone has to get a sticker.)
Hello! I'm not going to give a full solution but instead hints. I would suggest starting of with casework or trying this with smaller numbers. E.g. if Magnus only had 2 freinds and 4 stickers how many ways can Magnus give out the 4 stickers. Think about how many stickers the 1st freind can get at first then same for the 2nd freind and add your results up. Do you have any questions how to do this?