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.