![2nd term/ 5th \ term = ar/ar^4 = (2/5) / (16/135)\\=1/r^3 = 2*135/5*16 \\=1/r^3 = 27/8\\=1/r = \sqrt[3]{27/8} \\= 1/r = 3/2\\= r = 2/3](/tpl/images/0676/8003/8c8cd.png)
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