Calculus

Express the following in Sigma notation
2+8+18+32+50+72

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  1. hint:
    2+8+18+32+50+72
    = 2(1^2) + 2(2^2) + 2(3^2) + 2(4^2) + 2(5^2) + 2(6^2)

    Can you finish it?

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