in-how-many-ways-can-you-put-40-identical-balls-into-20-identical-boxes-such-that-each-box-obtains-at-least-one-ball-and-at-most-5-balls-

Question Number 175567 by mr W last updated on 02/Sep/22

i n h o w m a n y w a y s c a n y o u p u t 40

i d e n t i c a l b a l l s i n t o 20 i d e n t i c a l b o x e s

s u c h t h a t e a c h b o x o b t a i n s a t l e a s t o n e

b a l l a n d a t m o s t 5 b a l l s ?