Can anyone please check/confirm my work on this proof?

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SUMMARY

The discussion centers on the verification of a mathematical proof regarding the series 12 + 22 + ... + n². A participant points out that the original proof is incorrect because the final equation does not equate to the formula for n+1. Additionally, it is noted that the proof attempts to establish the wrong premise, confusing the series with the sum of the first n natural numbers (1 + 2 + ... + n).

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Homework Statement
Prove 1^2+2^2+...+n^2=(1/6)n(n+1)(2n+1) for all positive integers n.
Relevant Equations
None.
Please check/confirm my work of this proof and tell me if it's correct or not. Thank you.
 

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Your proof is not correct. Your final equation is not equal to the formula for n+1, and you are trying to prove the wrong thing anyway. The series is 12 + 22 +...+ n2, not 1 + 2 +...+n.
 
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