Someone who knows probability, please tell me what the odds are of only rolling 1-9, 30 times, on a 20 sided dice?
It's actually a pretty simple calculation. The odds of rolling anything on a die are (c/s)ⁿ where c is the number of sides that satisfy your condition, s is the total number of sides on the die, and n is the number of times you roll the die.
Given you roll a 20 sided die 30 times in a row and that each roll is independent, the odds you roll nine or below on each are P = (c/s)ⁿ = (9/20)³⁰ = 0.000000000039479843
You have a 00.000000003948% chance of rolling nine or below 30 times in a row.
