Question 4
Find the set of ordered 4-tuples of positive integers $[w,x,y,z]$ such that $$w+x+y+z=21.$$
Editorial clarification: the source asks for the set, while its answer key gives a count. For the answer box, enter the number of such ordered tuples. The solution also describes the full set.
Enter one positive integer, without units.
Editorial clarification: the source asks for the set, while its answer key gives a count. For the answer box, enter the number of such ordered tuples. The solution also describes the full set.
Enter one positive integer, without units.