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Triangular Numbers (Part II)

Triangular Numbers (Part II)

Update: 2006-09-17

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Using Gauss Idea to find the sum 1+2 + ... +n. Arithmetic progressions an obtaining a general formula for the sum of an arithmetic progression.

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Triangular Numbers (Part III)

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Triangular Numbers (Part II)

Triangular Numbers (Part II)

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Triangular Numbers (Part II)

Triangular Numbers (Part II)

Julio de la Yncera