Calculus
posted by Luis .
Express the following in Sigma notation
2+8+18+32+50+72

Calculus 
Reiny
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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