Plz help now!
(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.
a) Use sticks and stones. (20+5-1) choose (5-1) = 24 choose 4 = 10626.
b) If everybody gets one, then we only have to distribute 15 stickers, the same way. (15+5-1) choose (5-1) or 19 choose 4 = 3876.
Hope it helps!
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