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... then all outcomes are equally likely. Nothing more, nothing less. You can always re-define the outcomes so that they are not all equally likely. For example, on a single roll of a fair die, the numbers 1 to 6 are equally likely. But redefine the events so that Event A = prime number Event B = composite number Event C = neither prime nor composite number then P(A) = 1/2, P(B) = 1/3 and P(C) = 1/6 : events with unequal likelihood.
The probability of rolling a four on a 6-sided die is 1 in 6, or approximately 16.67%. Since the die has 6 equally likely outcomes (the numbers 1 to 6), and only one of those outcomes is a four, the probability is 1/6.
On a single roll, three out of the six possible outcomes are even numbers = 50%.
If you roll one cube, there are 6 possible outcomes.If you roll two cubes, there are 36 possible outcomes. But if you can't tellone cube from the other, then 1 - 2 looks the same to you as 2 - 1, sothere are only 18 different unique outcomes.