In how many ways can we distribute 16 chocalate donuts, 13 glazed donuts, and 15 jelly donuts among 4 people if each person insists on receiving at least 2 of each variety of donut? Help wanted soon please!
We can allocate the flavors separately, and take the product of the number of allocations of each flavor.
First off we give everyone their 2 donuts of each flavor.
That leaves 8 chocolate, 5 glazed, and 7 jelly.
Allocating each flavor is equivalent to sorting balls into bins with no restrictions. Thus we have
\(N = \dbinom{8+4-1}{4-1}\dbinom{5+4-1}{4-1}\dbinom{7+4-1}{4-1} = 1108800\)