Question 1
Find the ordered set of 4-tuples, of positive integers, $[w,x,y,z]$ such that: $$w+x+y+z=21.$$
**Editorial clarification.** The source wording asks for the set, while its key gives a count. For the answer box, enter the number of such ordered tuples. The solution also describes the full set.
Enter one whole number, without units.
**Editorial clarification.** The source wording asks for the set, while its key gives a count. For the answer box, enter the number of such ordered tuples. The solution also describes the full set.
Enter one whole number, without units.