Ononot — A geometric sequence has terms a1, a2, a3, \dots such that a

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Geometric Sequencesmedium

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A geometric sequence has terms $a_1, a_2, a_3, \dots$ such that $a_1 + a_2 = 15$ and $a_3 + a_4 = 60$ . What is the common ratio $r$ if $r > 0$ ?