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need help bad very confused

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3 Answers

Wild guess Σk=1k=5  k2, the sum of the squares of the first five natural numbers.
=(5)(5+1)(2×5+1)⁄6=55
The general formula is Σk=1k=n k2=(n)(n+1)(2n+1)/6

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Students should learn how to write problems properly. The way they write causes more confusion.