You are asking a question about experimental probability. The problem with that type of question is that the answer is different each time you run the experiment. That's why we call it experimental probability. The outcome will be different each time you run the experiment.
This is different than theoretical probability, where you can compute a probability based on some a priori knowledge of the conditions of the experiment. For instance, if you asked me what the probability of throwing a 3 or a 4 on a 12 number die, I could easily compute that as 2 in 12, or 1 in 6, or about 0.1667. Even multiple experiments can be predicted. For instance, if you asked me what was the probability of throwing a 3 or a 4 on a 12 number die three times in a row, I could also easily compute that as (2 in 12)3 or about 0.004630.
Alas, experimental and theoretical probability part company and one does not assure the other, unless you run a very large number of tests but, even then, you only do what we call approachthe theoretical results with the experimental outcome.
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You can't, can you? The smallest number that you can roll with four dice is four, that is, a 'one' on each of the four dice.
Yes, you can roll one die (of a two dice set) at a time. Statistically, since they are unrelated, even if rolled together, it does not matter if you roll one or two at a time.
No. Each roll is independent of the previous roll (on a fair dice). The same is true for flipping a coin. Getting a six your first roll does not make you any more or less likely to roll a six the second time.
Assuming they are fair, regular dice, the probability is 1/18.