swift: how to remove randomly from 1 to 3 items?

My code remove randomly only one coin. How i can remove randomly from 1 to 3 coins?

 @IBAction func endTurn(sender: UIButton!) { 
if coins.count > 0 {// @IBOutlet var coins: [UIButton]! (21 coins)
let index: Int = Int(arc4random_uniform(UInt32(coins.count)))
coins[index].hidden = true
 self.coins.removeAtIndex(index)
          if coins.isEmpty {
                println("GameOver")
            }
}
}