What is the probability with ten throws of the dice, that a six will come up exactly twice? The probability of a six (or any other number) is 1/6. The following formula combines these factors:
计算抛掷 10 次骰子中有两次掷中 6 点的概率。一次掷中 6 点（或其他任意一个点数）的概率为 1/6。 因此可列出下列计算公式：