Question: 2. Let A be an array of n distinct numbers. Ifi j and Ali> A[j] , then the pair (i,j) is called an inversion of

2. Let A be an array of n distinct numbers. Ifi

2. Let A be an array of n distinct numbers. Ifi j and Ali> A[j] , then the pair (i,j) is called an inversion of A. Suppose that the elements of A form a uniform random permutation of 1,2,.., n. Compute the expected number of inversions

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