GMAT Quantitative Reasoning Practice Test 6

Use statement (1) to write: $5^{\mathit{x}}{\left(\frac{1}{4}\right)}^{3\mathit{x}}={\left(\frac{5}{64}\right)}^{\mathit{x}}$. Because $\mathit{X}$ is a positive integer only, the expression will always be smaller than 1 . This statement alone provides us the answer. Use statement (2) to write: $5^2{\left(1∕4\right)}^{\mathit{\gamma }}\to$ the answer here is dependent on $\mathit{Y}$, a different combinations of the variable $\mathit{Y}$ will give different results.