1 2 3 , 1 3 4 , 1 4 5 , 1 5 6 , . . . , 1n 1n 2, . . . 12
Chapter 9, Problem 44(choose chapter or problem)
1 2 3 , 1 3 4 , 1 4 5 , 1 5 6 , . . . , 1n 1n 2, . . . 12
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