Show that if [9] = {1, 2, ..., 9} is partitioned into two classes then x1...

 

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Show that if [9] = {1, 2, ..., 9} is partitioned into two classes then x1 +x2 + 1 = x3 is solvable in one class. Show that if [9] = {1, 2, ..., 9} is partitioned into two classes then x1 +x2 + 1 = x3 is solvable in one class.