Question: Suppose we have a procedure RANDOM which given a set X of 2r elements generates a random subset X1 of size r. Describe an implementation

Suppose we have a procedure RANDOM which given a set X of 2r elements generates a random subset X1 of size r.

Describe an implementation of the algorithm RANDOM and prove that this will return a random subset of size X/2 of X when the input is a set X with an even number of elements.

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