Enrich · Mathematics Advanced 11–12 – Year 12 · Sequences and series
Enrich Define a sequence a_n to be a geometric sequence, or geometric progression (GP), if every ratio a_n/a_n - 1 of successive terms is the same where n ≥ 2, that is a_n = ra_n - 1 for some non-zero real number r called the common ratio
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