. Give a geometric and an algebraic proof that 1 C 2 C 3 C C .n 1/ C n C .n 1/ C .n 2/ C
Chapter 17, Problem 17.25(choose chapter or problem)
. Give a geometric and an algebraic proof that 1 C 2 C 3 C C .n 1/ C n C .n 1/ C .n 2/ C C 2 C 1 D n 2 :
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