Set Theoryhard
0:00.0

Let S={1,2,,10}S = \{1, 2, \dots, 10\}. Suppose we want to partition SS into three disjoint non-empty sets A,B,CA, B, C such that the sum of the elements in each set is equal. How many such partitions {A,B,C}\{A, B, C\} of SS exist?