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並前往https://stackoverflow.com/questions/30477246/geometric-sequence-how-to-find-common-ratio

Geometric sequence , how to find common ratio - Stack Overflow

Let a1 = 25, a4 = a*r^3 = 1. a4 / a1 => r^3 = 1/25. r = Cube root of (1/25). Three terms not needed. Hope it will solve!!

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