If this die (singular -- plural "dice"!) were the ordinary kind you find in board games, it would be a six-sided cube and all the faces would be equally likely to come up when the die is rolled. The die would be "fair."
The die in this problem is not fair. The sides are coming up with frequencies that are far from being equal. In an actual experiment with a fair die, you would expect each face to come up a NEARLY equal number of times. You would not expect the frequencies to be so different that one of them is 20 and another one is 2.