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What is the sigma of -2+6-18+54
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What is the sigma of -2+6-18+54

User Alan Jay Weiner
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\bf \begin{array}c -2\cdot (-3)^0&-2\cdot (-3)^1&-2\cdot (-3)^2&-2\cdot (-3)^3\\&&&\\ \cline{1-4} &&&\\ -2&6&-18&54 \end{array}~\hfill \displaystyle\sum\limits_(i=0)^(3)~-2(-3)^i

User Tigerden
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