Question: Suppose we want to extend the PositionalList interface to include a method, positionAtIndex(i), that returns the position of the element having index i (or throws

Suppose we want to extend the PositionalList interface to include a method, positionAtIndex(i), that returns the position of the element having index i (or throws an IndexOutOfBoundsException, if warranted). Show how to implement this method, using only existing methods of the PositionalList interface, by traversing the appropriate number of steps from the front of the list.

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