It's not supposed to be.
If it is, then the dice are referred to as "loaded", and using them in a game
can be hazardous to your health.
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With one roll of three dice, the probability is 7/8.
Assuming you are rolling a six-sided dice, it is 1/3 for one dice and 2/3 for two dice.
If the dice are fair, then it is 1/36.If the dice are fair, then it is 1/36.If the dice are fair, then it is 1/36.If the dice are fair, then it is 1/36.
The probability, when the 2-dice total is 5, that one of the two dice shows a two is 1/2. The probability that that die is selected is 1/4.The probability, when the 2-dice total is 5, that one of the two dice shows a two is 1/2. The probability that that die is selected is 1/4.The probability, when the 2-dice total is 5, that one of the two dice shows a two is 1/2. The probability that that die is selected is 1/4.The probability, when the 2-dice total is 5, that one of the two dice shows a two is 1/2. The probability that that die is selected is 1/4.
Assuming that these number cubes are ordinary dice (number are 1-6) and that both dice are balanced (equal chances for each side to turn up), then it's 1/36. There are 36 different possibilites for the upturned faces when a pair of dice is rolled, one of which is "4 and 4".