Geometric Progression - Prove that 1 + (1 + 2) + (1 + 2 + 3) + ... n terms = n/6 (n + 1) (n + 2) calculator

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Geometric Progression


	Problem 12 of 23

12. Prove that `1 + (1 + 2) + (1 + 2 + 3) + ... n` terms `= n/6 (n + 1) (n + 2)`

SolutionExample