Playing a range of sounds from an object

This might seem like a question people have posted but I want something different from mine. So far I have a script that looks like this which allows the play once of a sound.

var Sound : AudioClip;

private var hasPlayed = false;

function OnTriggerEnter(){ if(!hasPlayed){ audio.PlayOneShot(Sound); hasPlayed = true; } }

What I'm wanting is to have a range of sounds play, To have 3 different audio files and to have a randomised chance of playing each one, or better yet play the three in order. but separately after each time the player enters the trigger. I found something that looked like this but I don't know how to implement it. can anyone help me out?

 var sounds: AudioClip[]; // fill this array in the Inspector
 var SkateboardRoll: AudioSource;
 ...
   // choose a random sound to play:
   SkateboardRoll.clip = sounds[Random.Range(0, sounds.length)];
   SkateboardRoll.Play();