If three regular hexahedral dice marked with 1, 2, 3, 4, 5 and 6 are rolled at the same time, and the numbers are a, B and C respectively, what is the probability that a and B. C are exactly the three sides of a right triangle Another question: a school is going to organize teachers and students to watch Beijing ball games. There are three games in different periods of time, two of which are table tennis games and one is badminton games. If you choose any of the two games, what is the probability that the two games are table tennis games

The number that is exactly the length of the three sides of the right triangle is 3, 4, 5 dice. There are no other numbers
The probability is 1 / 6 * 1 / 6 * 1 / 6 * 6 = 1 / 36

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