1⁄160,000? First of all, why the probability 1/20? I am aware of how dice work, but given how unlikely this outcome seems, perhaps we should consider the possibility that these aren’t perfect dice? If they’re even 1% more likely to come up 20s then instead of the probability being 5% (1/20) it’s 6%, and the previous 1⁄160,000 odds more than double!* Or maybe the game mechanics allow for re-rolls?
The probability you gave, is a probability for a “single roll”.
*Though this would require all 4 dice to be 1% more likely to come up 20s.
When Should Unlikely Events Be Questioned?
1⁄160,000? First of all, why the probability 1/20? I am aware of how dice work, but given how unlikely this outcome seems, perhaps we should consider the possibility that these aren’t perfect dice? If they’re even 1% more likely to come up 20s then instead of the probability being 5% (1/20) it’s 6%, and the previous 1⁄160,000 odds more than double!* Or maybe the game mechanics allow for re-rolls?
The probability you gave, is a probability for a “single roll”.
*Though this would require all 4 dice to be 1% more likely to come up 20s.