For questions 1-4, you will be rolling a 20-sided die (sides are numbered 1-20). This die is fair (i.e., each number is equally likely).

You roll the dice once. What is the probability that you get a roll less than 5?

You roll the die twice. What is the probability that you roll 1 on the first roll and 20 on the second roll?

You roll the die twice. What is the probability that you roll a 10 at least once?

You roll two of these 20-sided dice at the same time. What is the probability that the sum of the two rolls (value of the first die + value of the second die) is 10 or less?