MathDB
Team Round P8

Source:

October 16, 2021
MOAA 2021team

Problem Statement

Evaluate 27×30+26×31+25×32+⋯+20×37.2^{7}\times 3^{0}+2^{6}\times 3^{1}+2^{5}\times 3^{2}+\cdots+2^{0}\times 3^{7}.
Proposed by Nathan Xiong
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