\(3.B=3^2+3^3+3^4+...+3^{2006}\)
\(2B=3B-B=3^{2006}-3\Rightarrow2B+3=3^{2006}\)
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\(3.B=3^2+3^3+3^4+...+3^{2006}\)
\(2B=3B-B=3^{2006}-3\Rightarrow2B+3=3^{2006}\)