Method and examples
Geometric Progression
Problem 13 of 23

13. Prove that `1 * (2^2 - 3^2) + 2 * (3^2 - 4^2) + 3 * (4^2 - 5^2) + ... n` terms `= n/6 (n + 1) (4n + 11)`
 
 
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