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Suppose that the splits at every level of quicksort are in the proportion $(1 – \alpha)$ to $\alpha$, where $0<\alpha\leq\frac{1}{2}$ is a constant. The minimum depth of a leaf in the recursion tree is approximately given by

- $-\frac{lgn}{lg(1-\alpha)}$
- $-\frac{lg(1-\alpha)}{lgn}$
- $-\frac{lgn}{lg\alpha}$
- $-\frac{lg\alpha}{lgn}$

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