Probability is also called "probability". It reflects the possibility of random events. Random events refer to events that may or may not occur under the same conditions.

According to your description, answer the question about the death probability of Russian turntable:

On the surface, there are only two outcomes for participants: survival or death, and the probability of death is 1/2.

But the possibility of participants getting a certain result is unequal.

For example, the result of death, provided that a bullet is shot, the probability of the bullet being shot is 2/6.

As a result of survival, the condition it produces is whether the bullet is shot or not, and the probability is 4/6.