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Roll Set

How Would I figure this out?

I have a 20-sided dice and i was wondering how to figure out the probability of the two sets of numbers i rolled:

Roll set 1:
19,9,9

Roll set 2:
4,20,20

I just think its not that common to get two repeating numbers in both sets of the three rolls
i just wanna know how to do this

The probability of rolling any number on a fair 20 sided icosahedral die is 1/20, irrespective of any previous rolls.

Roll 1: P(19, 9, 9) = 1/20 * 1/20 * 1/20 = 1/8000

same as for Roll 2

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