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seen Apr 24 '12 at 15:32

Apr
24
awarded  Teacher
Apr
24
awarded  Editor
Apr
24
revised Direct Proof that $1 + 3 + 5 + \cdots+ (2n - 1) = n\cdot n$
added 16 characters in body
Apr
24
answered Direct Proof that $1 + 3 + 5 + \cdots+ (2n - 1) = n\cdot n$