Two consecutive questions of doing quick sort

What is the worst case size of SL and SR (in terms of n ) when you divide a list of unsorted items of size n into groups of (27)+1 while selecting a pivot? Input your answer as a decimal to three places. E.g. 3n/8 would be 0.375 4 What is the recurrence relation of the Deterministic Selection algorithm using the group size specified in problem 3