Given arrangement: \[9,\text{ }12,\text{ }16,\text{ }24,\text{ }\ldots …\]

Since,

\[12/9\text{ }=\text{ }4/3;\text{ }16/12\text{ }=\text{ }4/3;\text{ }24/16\text{ }=\text{ }3/2\]

\[12/9\text{ }=\text{ }16/12\text{ }\ne \text{ }24/16\]

Along these lines, \[9,\text{ }12,\text{ }16,\text{ }24\text{ }\ldots \]isn’t a G.P.