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Consider the Quicksort algorithm. Suppose there is a procedure for finding a pivot element which splits the list into two sub-lists each of which contains at least one-fifth of the elements. Let $T(n)$ be the number of comparisons required to sort $n$ elements. Then

1. $T(n) \leq 2T(n/5) + n$

2. $T(n) \leq T(n/5) + T(4n/5) + n$

3. $T(n) \leq 2T(4n/5) + n$

4. $T(n) \leq 2T(n/2) + n$

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