What is the relationship between a-causality and randomness? Let's look at the argument below: For something to be (truly/inherently) random there cannot be a cause. Because, if there is a cause then the cause can be studied and the result/output can be predicted and hence there would no randomness. True Randomness means something that cannot be predicted. We can predict whether will be an interference pattern or not, however we cannot predict the location of any individual/single photon/electron on the screen. We can, in principle, predict the results of a roll of a dice (or toss of a coin) if we took into account all the factors such initial forces on the dice during the toss, effect of air molecules etc. Since the roll of a dice has a cause its predictable.