random value apears onece kotlin android
val unpickedNumbers = (0..75).toMutableSet()
nextnumberbutton.setOnClickListener {
if (unpickedNumbers.isEmpty()) {
Toast.makeText(context, "All numbers already picked", Toast.LENGTH_LONG).show()
return
}
val rand = unpickedNumbers.random()
numbertextview.text = rand.toString()
unpickedNumbers.remove(rand)
}