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We are going to write a function that computes the sum of the first n elements of an array. The JavaDoc of this function is as follows: This function adds all the numbers in the array, from index 0 to n, which is given as an input parameter. Parameters: array is an integer array n is the index up to which, the sum calculated. Returns: returns the sum of the elements of the array from index 0 to n. Throws: BadinputException - if n >= array.length or n