Mathematics, 27.05.2021 16:20 ultimatesaiyan
What is the first part of the second step to prove that Sn=>3+8+15+...+ n(n-3)=n(n+1)(2n+7)/6
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What is the first part of the second step to prove that Sn=>3+8+15+...+ n(n-3)=n(n+1)(2n+7)/6...
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