For which value of b is this fraction undefined?

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

What is the base of 1/9 to the power of 2

Can someone me do math because i am having a breakdown rn because i don’t get it