China Naming Network - Eight-character query< - Three people were randomly selected from 13 people. What is the probability of winning a for the third time?

Three people were randomly selected from 13 people. What is the probability of winning a for the third time?

I got an A for the third time, which means I didn't get an A for the first two times.

Then, for the first time, randomly select one of the rest 12 people except A, that is, 12/ 13.

The second time, one person was randomly selected after the first nail removal:1112.

The third time, I got a111

Three times add up to (12 ÷13) × (11÷12 )× (1÷/kloc)

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