1. a) Given the array of numbers 50 10 90 120 -13 3 89, you are asked to apply BinarySearch to find a certain number. What would be the best achievable time complexity? Give reason b) Let's say we are running QuickSort on an array of size 900. Our algorithm has completed 90 partitions. How many items in the array is now guaranteed to be in their designated spot? c)What can cause worst performance for quick sort algorithm on this array of 900 items?

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A: Here is the explanation about both the functions: