Question about probability.

[Person S]

Hello everyone.
I would like to know about the probability.
Let's say 3 different DS came up in 3 spins. That's = 18 numbers.
Now I bet on all of them, what is the probability that one of these 3 will come up in the next spin. The probability is the same as for EC or different.

[TRD]

18/37
--
1-19/37
--
1-(37-18)/37 EC
1-(37-6-6-6)/37 3DS

Same thing, isn't it?

[Person S]

Yes, thank you, that's exactly it.