I have the same problem. Shouldn’t the ratio be (2/3)^8? In the problem, both sequences start with 1A48EF776-11FE-480A-8794-7E0CCFA03A04.jpeg

In the solution, however it is clear that the sequences start with 2 and 3 respectively09DAAA46-3697-4691-B2C8-E9B2BC84405E.jpeg