how to get two defrent random nambers in unity code example

Example 1: javascript get random number in range

function getRandomNumberBetween(min,max){
    return Math.floor(Math.random()*(max-min+1)+min);
}

//usage example: getRandomNumberBetween(20,400);

Example 2: generate random number in java within a range without repeating with android studio

public void NextRandom(View view) // button clicked function
    {
        int previousIndex = index;
        index = rand.nextInt(array.size());

        while (index == previousIndex)
        {
            index = rand.nextInt(array.size());
        }
    }