permutation and combination question?
How many ways are there to distribute 40 identical marbles among 4 children without restriction
- BrianLv 79 years agoFavourite answer
There would be (43 C 3) = 43!/(40!*3!) = 12341 ways to distribute the marbles.
This is the same as the number of solutions to the equation w + x + y + z = 40,
where w, x, y and z are all integers greater than or equal to 0. Let each marble
be represented by an o and let the + signs be the dividers between the collection
of marbles each child ends up with. Then every distribution of marbles will be
an arrangement of 40 o's and 3 +'s, and there are (40+3)! / (40!*3!) = (43 C 3)