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posted by Luis Tuesday, January 5, 2010 at 11:41pm.

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

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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