Possible sum of partition of set {1, 2, 3,.... 20} are
(1) 105, 105
{1, 2, 3, 4, 5, 6, .... 14}, {15, 16, 17, 18, 19, 20}
(2) 70, 70, 70
{20, 19, 15, 16}, {11, 10, 17, 18, 14}, {1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 13}
(3) 42, 42, 42, 42, 42
(4) 35, 35, 35, 35, 35, 35
(5) 30, 30, 30, 30, 30, 30, 30
(6) 21, 21, 21, 21, 21, 21, 21, 21, 21, 21