Ononot — If the sequence a1, a2, a3, \\ldots is a geometric sequence

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Geometric Sequenceshard

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If the sequence $a_1, a_2, a_3, \\ldots$ is a geometric sequence with common ratio $r$ , which of the following is the common ratio of the sequence $\\frac{1}{a_1}, \\frac{1}{a_2}, \\frac{1}{a_3}, \\ldots$ ?