Lemma
EasyBinomial theorem
OpenStax, Intermediate Algebra 2e §12.3 Geometric Sequences and Series · Try It 10 · Algebra · Binomial theorem

Geometric Sequences and Series · Try It 10

Find the sum of the first 20 terms of the geometric sequence 6, 18, 54, 162, 486, 1,458, …

~5 minAnswer checked instantly

OpenStax, Intermediate Algebra 2e · §12.3 Geometric Sequences and Series · Try It 10

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Checked against the answer in OpenStax, Intermediate Algebra 2e.